Best king size mattress in 2024: big beds for all budgets

If you need the best king size mattress, we can hook you up with a big bed that'll suit your needs perfectly. Whether you want to splurge on a high-end hybrid mattress that's genuinely fit for a king, or instead give yourself maximum bed space at a low price with a cheaper memory foam option, we can help you find a king size bed that's right for you. 

We've picked out eight of the best king size mattresses on the market right now, and because our reviewers have slept on them all for at least three weeks as well as subjecting them to our standardized mattress tests, we know that they hit the mark in terms of comfort and quality (and we can let you know why they might not fit your requirements, too).

King size mattresses are designed to accommodate two people, leaving lots of room to spread out. They're a step up from queen size, which is the most popular mattress size, and you'll find that all our best mattress picks are available in a king size. It's usually the ideal bed size for bigger bodies, however if you're especially tall you might get on better with a California king size mattress, which is slightly narrower but a bit longer.

There's generally another king size option available: the split king (essentially a pair of twin size mattresses joined together), which is a good choice if you're concerned about motion transfer across the bed surface. All these options are a whole lot of bed, however, and if you don't quite have room in your bedroom, look instead at our best queen size mattress guide for some less expansive options.

In this best king size mattress guide we've found options in every price range, and provided deals info with each entry so you know if you're getting a good deal or not (mattress sales happen all year round, but some offers are better than others). Read on to see the best king size mattresses available now, delivering top support, comfort and sleep quality.

What size is a king size mattress?

In the US, a king size mattress is 76 inches wide and 80 inches long (that's 193cm wide and 203cm long). However, US and UK king size beds are not the same. In the UK, a king size bed is 60 inches wide and 79 inches long (that's 150cm wide and 200cm long). This guide focuses on US king size mattresses.

The quick list

The best king size mattress in 2024, as chosen by experts

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Best king size mattress overall

The Saatva Classic mattress shown on a stylish bed frame in a neutral colored bedroom

(Image credit: Saatva)
The best king size mattress overall

Specifications

Type: Innerspring hybrid
Materials: Pillow top, memory foam, other foam, pocket springs, open coils
Firmness (1-10): 3, 5-7 or 8
Height: 11.5 or 14.5"
Trial: 365 nights
Warranty: Lifetime
Price bracket: Premium

Reasons to buy

+
Customizable firmness and height 
+
Superb back support 
+
Excellent temperature regulation

Reasons to avoid

-
 $99 fee to refund or exchange 
Buy it if

✅ You want to choose your own depth and firmness: The Classic has three firmness options and two heights which means you can find the perfect feel for you regardless of your build and how you tend to sleep.

✅ You suffer from back pain: The Classic is designed with Lumbar Zone technology, approved by the Congress of Chiropractic State Associations, that can keep your back aligned and reduce pain.

Don't buy it if

You have a small budget: A Saatva Classic in a king size is going to cost you over $2,000, and while that's a good price for this mattress, you might want to consider the more affordable DreamCloud mattress.

❌ You share with a fidgety partner: The only area in which the Saatva Classic doesn't quite excel is in motion isolation; it's good but a restless co-sleeper could disturb you. Try the DreamCloud or Layla Hybrid instead.

The bottom line

🔎  The Saatva Classic is a brilliant all-rounder that comes in a variety of configurations that will suit just about all sleepers. It's comfortable and supportive in any position and it sleeps cool, too, and if you want a bed that's flawlessly crafted and delivers hotel-style luxury, it should be your top choice. ★★★★½

Looking for hotel-style luxury? Here's our top pick. The Saatva Classic is the the flagship model from one of the top sleep brands in the US, and it comes in three firmnesses as well as two heights, so you can choose your own just-right option.

Design
This hybrid mattress features a cushioned Euro pillow top with a high-density memory foam lumbar crown to provide extra support in the center third of the mattress. Below that is a layer of pocketed steel coils that deliver responsive, cradling support, and beneath this is a base layer of heavier open coils for durable support and improved airflow. Finally, high-density foam rails around the edge give you plenty of edge support.

Comfort and performance
Because you get a choice of three firmness levels you'll almost certainly be able to find a Saatva Classic that fits your comfort preference.  The Luxury Firm option should suit most sleep styles and body weights, while side sleepers and lighter people may get on on better with the Plush Soft version. Back and stomach sleepers should consider the Firm model for its extra support. This is the version we tested and we found it incredibly comfortable with a degree of sink-in softness thanks to the pillow top. Saatva's Lumbar Zone technology, which is approved by the Congress of Chiropractic State Associations, makes it great at preventing back pain too.

When we reviewed the Saatva Classic we found it absorbed motion well, although other reviewers have found that the softer versions have a degree of motion transfer. Edge support was strong, the overall level of comfort was high, and this one sleeps nice and cool, too, which is largely down to the large number of coils and very little memory foam.

Value for money
This is a premium mattress, and MSRP has crept up since we first reviewed it. With regular Saatva discounts you're likely to pay around $2,200 for the Classic in a king size. Despite this we feel that the Saatva Classic offers good value for money; it's supremely well-made, and the extras are among the best: you get a year's trial and a lifetime warranty, and there's free white glove delivery direct to a room of your choice. There's a $99 fee for returns, though, which most brands don't charge for.

Best king size mattress for couples

The DreamCloud Luxury Hybrid Mattress, pictured here with a very relaxed dog on top

(Image credit: DreamCloud)
The best king size mattress for restless couples

Specifications

Type: Hybrid
Materials: Memory foam, other foams, coils
Firmness (1-10): 6.5
Height: 14"
Trial: 365 nights
Warranty: Lifetime
Price bracket: Lower-mid / mid-range

Reasons to buy

+
Excellent motion isolation 
+
Superb edge support 
+
Great value

Reasons to avoid

-
Runs a little warm
Buy it if

✅ You can't quite afford a Saatva: We consider the DreamCloud to be a more budget-friendly alternative to the Saatva Classic. It's comfortable and supportive and impressively luxurious for the price.

✅ You suffer from joint pain: The DreamCloud's has a deep layer of various foams at the top, and these mold around you to cushion your joints and relieve pressure so you won't wake up feeling sore.

Don't buy it if

You're a lighter side sleeper: The DreamCloud is quite a firm mattress, and if you're a light side sleeper you'll know about it. For a mattress designed specifically for side sleepers, try the Helix Midnight.

❌ You don't like deep mattresses: The DreamCloud is 14" deep, which is a fair bit thicker than the average mattress, which means that you might need invest in deeper sheets to fit it.

The bottom line

🔎  The DreamCloud mattress is the perfect choice for anyone who wants hotel luxury but can't stretch to the price of the Saatva Classic. It's a high-quality bed at an affordable price, with excellent pressure relief and motion isolation plus good temperature regulation, and a medium-firm feel that'll suit most side and back sleepers. ★★★★½

Do you share your bed with someone who moves around a lot (or vice-versa?) Then you'll need a king-size mattress that offers low motion transfer, which means that when one of you moves, it doesn't disrupt the other too much. Our top pick is the Dreamcloud, which also has the benefit of offering a luxurious experience at a more affordable price than the Saatva Classic above. 

Materials
This 14-inch hybrid mattress has five layers: a soft-touch cover, then three foam layers, including one infused with cooling gel and a transition later designed to help keep your spine aligned as you sleep. A base layer of 8-inch wrapped coils gives the mattress a bit of bounce and helps regulate temperature by providing airflow; these coils are reinforced at the perimeter to provide edge support. If you're not bothered about springs, you could oft for the all-foam version (introduced in fall 2023), but given that at time of writing it costs more than the hybrid, we'd recommend the model with springs. 

Firmness and comfort
Our tester rated it at a 7.5 for firmness, which means it should suit most people, although if you're of a lighter build and tend to sleep on your side you'll likely find it to be a bit too firm for your liking. There's plenty of comfort and pressure relief thanks to the thick memory foam layer that cradles your joints.

Performance
The DreamCloud is a good choice if you enjoy the feel of memory foam but would prefer the extra bounce and responsiveness that you get from springs. In our review we scored it highly for support, pressure relief, motion isolation and edge support. On the downside, we found that despite the sprung layer it sometimes ran a little warm. 

Value for money
Pay no attention to the MSRP; the DreamCloud is always discounted. The actual discount can fluctuate, but the price tends to hover around the mid-range / lower mid-range bracket, and you're always getting a good deal. The 365-night sleep trial, forever warranty and overall quality means this mattress offers excellent value. It's our top pick as the best luxurious bed in a box mattress.

Best king size memory foam mattress

The Nectar Mattress on a bed

(Image credit: Nectar)
The best king size mattress for fans of memory foam

Specifications

Type: All-foam
Materials: Memory foam, other foams
Firmness (1-10): 6.5
Height: 12"
Trial: 365 nights
Warranty: Forever
Price bracket: Lower-mid

Reasons to buy

+
Superior motion isolation 
+
Strong pressure relief 
+
Decent cooling properties

Reasons to avoid

-
All-foam isn't for everyone
Buy it if

✅ You need plenty of cushioning: There's plenty of sink-in comfort to the Nectar, thanks to its memory foam, so it'll contour to your body shape and cushion your joints while you sleep.

✅ You share with a restless partner: Because it's an all-foam mattress with no bouncy springs, the Nectar absorbs motion brilliantly, which means there's no danger of a wriggly co-sleeper disturbing you.

Don't buy it if

You sleep hot: As an all-foam bed the Nectar can trap heat at night; for a cooler option we'd recommend either the Saatva Classic or, if you're set on a foam mattress, the Cocoon by Sealy Chill.

❌ You need extra support: Heavier sleepers, stomach sleepers and some back sleepers may need a firmer bed that'll keep their spines aligned properly. Saatva's Loom & Leaf is a premium all-foam mattress with great support.

The bottom line

🔎  The Nectar Memory foam is a brilliant option if you're after a mattress that gives you a memory foam hug as well as offering great value for money. It's suitable for most sleepers but especially good for side sleepers, as its contouring foam delivers excellent pressure relief on shoulders and hips. ★★★★

The Nectar Memory Foam mattress is a popular all-foam model that's a good fit for a wide range of sleepers, and we rate it as the best memory foam mattress on the market. It's a mid-range mattress that delivers a lot for its price, and if you enjoy the distinctive hug of memory foam and don't like too much bounce in your bed, you'll get on really well with it.

Design
This 12-inch deep mattress is constructed with three layers of CertiPUR-US certified foam: there's a three-inch layer of contouring memory foam infused with cooling gel, followed by three inches of bouncier foam, and at the bottom a sturdy layer of base foam to keep everything steady.  which means it contours to your body, making it a strong choice for side sleepers and joint pain sufferers. 

Firmness and comfort
If you like the distinctive 'hug' of memory foam, the Nectar Memory Foam mattress definitely delivers. Its contouring feel delivers support where it's needed, but without the you sinking so far into it that you can't easily change position in the night. It's officially rated as 6.5 (medium firm), although in practice we'd say it skews closer to a 7, making it a comfortable choice for most body types, although if you sleep on your stomach or if you're of a heavier build you should choose something firmer in order to get better spinal support.

Performance
In our review we found that the Nectar Memory Foam mattress scored well in nearly all areas. Our tester, who is a combination sleeper, found it provided good levels of comfort and pressure relief, and some cooling, thanks to its woolen cover and gel-infused foam layer; that said, it still slept slightly warm at timer. We also tested its ability to absorb motion and got some impressive results, making it a good choice for couples too. 

Value for money
At MSRP the Nectar Memory Foam mattress is a mid-range option, but you'd have to be extraordinarily unlucky to ever be charged the MSRP. A 33% off discount runs pretty much throughout the year, with Nectar sometimes offering even bigger savings on or around major sale days. You'll get a year-long trial and a forever warranty, too.

Best cheap king size mattress

The Siena Memory Foam Mattress on a bed

(Image credit: Siena Sleep)
The best cheap king size mattress

Specifications

Type: All foam
Materials: Memory foam, other foams
Firmness (1-10): Officially 6.5, we rate 9
Height: 10"
Trial: 180 nights
Warranty: 10 years
Price bracket: Budget

Reasons to buy

+
Low price
+
Very supportive
+
180-night sleep trial

Reasons to avoid

-
Firmer than advertised
Buy it if

✅ You're on a budget: The Siena Memory Foam is an affordable bed that nevertheless turns in an impressive performance for its low price.

✅ You're a back or stomach sleeper: Siena rates this mattress as medium-firm; we found it to be much firmer than that, which means it's best suited to back and stomach sleepers who'll need extra support. 

Don't buy it if

You want a hybrid bed: The Siena's an all-foam mattress and doesn't have the bounce of a hybrid. The Allswell is a cheap hybrid alternative but it's less suitable for every-night use than the Siena.

❌ You sleep on your side: Because it's extremely firm, side sleepers will find the Siena Memory Foam doesn't provide enough cushioning for hips and shoulders; consider spending a bit more on the Nectar mattress instead.

The bottom line

🔎  The Siena Memory Foam is an all-foam mattress at a very affordable price, and although it's not the cheapest king size mattress listed here it delivers an impressive level of quality for what you'll pay. It's extremely firm, though, and best suited to back and stomach sleepers. ★★★★½

We rate the Siena Memory Foam as the best cheap mattress, and while it's not the cheapest king size mattress listed here, we think it should be your first choice if you're after an affordable bed simply because of its quality. This is a firm mattress that's a great choice for back and stomach sleepers, and Siena shares a parent company - Resident Home - with Nectar Sleep, which means it's a brand you can depend on.

Design
The 10-inch Siena mattress has a simple but effective design. It's made with three layers of foam: a contouring gel-infused memory foam layer on top to provide cushioning, a central layer of support foam, and a layer of dense base foam that keeps the whole mattress stable. There's a soft and breathable top cover and a more durable, shift-resistant lower cover to hold the mattress in place.

Comfort and performance
While Siena rates its memory foam mattress as 6.5/10 medium-firm; we found it to be a lot firmer than that and would instead rate it as a 9/10, so it should be no surprise to learn that it's featured in our best firm mattress guide. As such it's best suited to back and stomach sleepers; side sleepers will find it doesn't provide enough cushioning for a comfortable night.

Buying a cheap memory foam mattress can be a risk, because cheap foam simply doesn't perform as well as more premium foam, which can mean that it traps heat and provides little in the way of edge support. That's not the case with the Siena, though; we found that it stayed comfortably cool, and its foam was consistently firm from the center of the bed all the way to the edges. And as well as impressive edge support, this mattress also absorbs motion really well, so nobody's going to be disturbed by a partner's movements.

Value for money
The Siena Memory Foam mattress is never sold at full price, and the bottom line is that in Siena's evergreen sale you'll pay $499 for a king size. While the Allswell further down the page is cheaper, we feel that the Siena is much better value in terms of quality, comfort and performance. The extras are impressive for the price, too; you'll get a 180-night trial and a 10-year warranty as well as free shipping and returns.

Best luxury king size mattress

Helix Dusk Luxe mattress

(Image credit: Helix)
The best luxury king size mattress

Specifications

Type: Hybrid
Materials: Foams, wrapped coils
Firmness (1-10): 6
Height: 13.5"
Trial: 100 nights
Warranty: 15 years
Price bracket: Premium

Reasons to buy

+
Ideal for back and stomach sleepers
+
Great pressure relief
+
Good motion isolation

Reasons to avoid

-
Not firm enough for those over 230 lbs
-
Can sleep a little warm
Buy it if

✅ You want a luxurious look and feel: The Dusk Luxe's plush feel and pillow-top detail give it a hotel mattress kind of vibe.

✅ You want cushioning but not too much sink: The upper layers of foam provide plush cushioning, but this mattress won't contour to your form like memory foam would. Perfect if you prefer a more responsive feel. 

Don't buy it if

You're a side sleeper: Some side sleepers might prefer something with more sinkage around the shoulders and hips – consider sister model, the Helix Midnight.

❌ You weigh over 230lbs: We suspect heavier people will sink through the comfort layers, and won't find the support they need from this mattress.

The bottom line

🔎  The Helix Dusk Luxe is a dreamily comfortable, luxurious feeling mattress. The pillow-top delivers comfortable cushioning and it's far more supportive than its medium feel would suggest. ★★★★

The Helix Dusk Luxe is our best luxury king side mattress pick. The pillow-top and plush feel give a hotel bed kind of vibe. It's geared towards back and stomach sleepers, and is more supportive than you'd expect for this level of softness, too.

Design
The Helix Dusk Luxe is a 13.5 inch tall hybrid mattress with a design that includes layers of foam, springs, and a pillow-top. For the cover, you have an option to upgrade from the standard soft Tencel to a cooling 'GlacioTex' option. Rather than classic memory foam, this uses a 'latex foam alternative', which isn't latex, but mimics its bouncy, responsive feel. The individually wrapped coils boost breathability.

Comfort and performance
The upper layers of foam give this mattress a cozy and plush feel, although you won't sink in like you would with memory foam. This might put off some side sleepers, and if you want more of a contouring feel, check out our roundup of the best mattresses for side sleepers

With a medium feel (around 6 out of 10), the Dusk Luxe is softer than we'd typically recommend for back and stomach sleepers. However, it's deceptively supportive, and our testers felt well propped up beneath their hips in this position. However, it might still be a bit too soft for those over 230lbs. 

It's testament to just how comfortable our reviewers found this mattress that we still recommend it, because other aspects of performance were average. The bouncier foam means this mattress has marginally more motion transfer than other models (although it should still be fine for all but the most sensitive sleepers), we'd expect good side support on the king size model but not so much on the corners and foot edge. Finally, temperature regulation is fine but not exceptional. 

Value for money
Helix Dusk Luxe is never sold at MRSP – expect 20 per cent off, rising to 25 per cent around major sales events. Our Helix sales and deals page will keep you up to date with all the best offers. The extras are average – you'll get a 100-night trial and 15 year warranty, and there's free delivery to your door. Sadly, there's no option to upgrade to white glove delivery.

Best king size mattress for guests

Layla Hybrid Mattress

(Image credit: Layla)
The best king size mattress for guests

Specifications

Type: Hybrid
Materials: Memory foam, other foams, coils
Firmness (1-10): Soft side: 4-4.5; firm side: 6.5-7
Height: 13"
Trial: 120 nights
Warranty: 10 years
Price: Upper-mid / premium

Reasons to buy

+
Choice of firmness levels 
+
Powerful motion isolation 
+
Strong edge support 

Reasons to avoid

-
Neither side very firm/soft
Buy it if

✅ You need a choice of firmness levels: The Layla Hybrid's flippable design means that you have two comfort options: a firmer feel on one side of the mattress and a softer feel on the other.

✅ You sleep warm: This mattress has a layer of springs in the center that promote airflow, while the foam layers are infused with copper gel that add to the bed's cooling properties and can help keep temperatures down.

Don't buy it if

You know your preferred firmness: If you're going to stick to one side then there's not much point in choosing the Layla Hybrid; instead choose the DreamCloud if you go firm, or the Helix Midnight for something softer.

❌ You plan to move it by yourself: The Layla Hybrid is one heavy mattress, and our reviewer had to enlist the help of a neighbor to get it onto her bed. Worth bearing in mind if you'd planned to move it single-handed.

The bottom line

🔎  The Layla Hybrid mattress is a versatile bed that you can flip to change from softer to firmer comfort levels. This makes it a good choice for a spare room if you have picky guests; it's also great at motion isolation and edge support, and it's a strong choice for most sleep styles and body types. ★★★★½

For the ultimate in customizability, the Layla Hybrid mattress comes with two sides: one soft, one firm. That means you can flip it for guests who prefer one over the other, or you can of course buy it for yourself if you're not entirely sure whether you prefer a firmer or softer mattress.

Design
This is a hybrid mattress with a generous depth of 13 inches and five layers. In the middle there's a sprung support core made up of six-inch pocket coils, with 14 gauge coils in the center and heftier 16 gauge coils in a double row around the edges to provide better edge support. On the firm side there's a 1.5" layer of poly foam and a one-inch of copper-gel memory foam, while on the soft side there's two inches of poly foam and a 2.5" layer of copper-gel memory foam.

Comfort and performance
We'd say that the firm side of the Layla Hybrid rates a 6.5 to 7 out of ten for firmness, so it'd be the side that back, stomach sleepers and some side sleepers will get on with best. The soft side is about a 4.5 with more contouring and pressure relief, and as such it's the more attractive option for side sleepers; in actual fact we found that it was comfortable in all sleeping positions. Because neither side is radically soft or firm, this probably isn't the mattress for you if your tastes are more for a really soft or firm bed.

Our tester found this mattress to be comfortable and supportive, strong on motion isolation, thanks to its foam layers, and it did a good job of temperature regulation thanks to the gel foam and airflow through the sprung core. She preferred the firm side, but only slightly, and found that the mattress was good at motion isolation, edge support and temperature regulation. One other thing that's worth mentioning: this is a really heavy mattress that you may struggle to move single-handed.

Value for money
The Layla Hybrid is essentially two mattresses in one, and as you might expect, you pay for this privilege. Even with the usual $200 off deal, the Layla Hybrid mattress still sits in the premium price bracket. Layla tends to offer free gifts with purchase as well, so you might be able to grab pillows, sheets, or a comforter to go with your mattress. We'd prefer to see a longer trial than the 120 nights you get from Layla, but you'll also get a 10-year warranty as well as free shipping and returns.

Best budget hybrid king size mattress

The Allswell Mattress on a bed frame

(Image credit: Allswell)
The best budget hybrid king size mattress

Specifications

Type: Hybrid
Materials: Memory foam, coils
Firmness (1-10): 7
Height: 10"
Trial: 100 nights
Warranty: 10 years
Price bracket: Budget

Reasons to buy

+
Low price
+
Hybrid design
+
Good motion isolation

Reasons to avoid

-
Not the deepest
-
Limited trial period
Buy it if

✅ You're on a tight budget: An Allswell Hybrid mattress in a king size will currently cost you $357 at Walmart, which is great value for money and less than you'll pay for most twin mattresses.

✅ You're buying for a spare room: We'd suggest spending a bit more money on a mattress you intend to sleep on every night, but for a bed that's only used occasionally this is a great choice.

Don't buy it if

You're a side sleeper: The budget-priced Allswell doesn't really have enough cushioning for shoulders and hips, which means that side sleepers would get on better with something like the Nectar mattress.

❌ You weigh more than average: The Allswell's relative lack of cushioning will likely make it a no-go for heavier sleepers, as they'll could easily sink through the thin foam layer and end up resting (or not) on the springs.

The bottom line

🔎  The Allswell mattress is a lot of mattress for not very much money, and while it's not without its shortcomings it definitely performs well for what you pay. There's good motion isolation and temperature regulation but a bit of a lack of cushioning; we think this is more of a mattress for occasional use. ★★★★

If your budget is very tight, Walmart's Allswell mattress has a lot to offer at under $400. Its design is basic and it suffers in comparison with the other mattresses listed here, but it's astonishingly cheap for a hybrid mattress and when we reviewed it we found that despite some shortcomings, it performed well and offered good value for money.

Design
The Allswell's hybrid design features a quilted top panel, a layer of memory foam, and a base layer of pocket coils. This combination of materials offers surprisingly good motion isolation and edge support for a budget mattress. Plus the foam layer is infused with charcoal and copper gel, which combine with the airflow provided by the pocketed coils to keep things cool on hot nights.

Comfort and performance
We'd rate this mattress as a seven out of 10 on the firmness scale. That medium firm feel makes it particularly suited to light and average-weight back and front sleepers. Heavier people and side sleepers may struggle to get comfortable on the Allswell, though. It's only 10 inches deep, which means it's a little low on cushioning compared to deeper mattresses, and if you sleep on your side you'll probably find there isn't enough pressure relief for your shoulders and hips, while heavier people may find themselves sinking through the foam and resting on the coils.

In our tests, the Allswell delivered strong motion isolation and very good temperature regulation, and the mattress's edge support was impressive as well. Durability could be an issue, as many customers complain of the sides and middles starting to sag after a while. 

Value for money
The Allswell mattress falls firmly into the budget price range. Even at MSRP, this is a remarkably affordable mattress. Discounts aren't frequent, but it's hard to complain when the prices are so low to begin with. And if you don't expect too much from it, the Allswell offers great value for money; you'll get a 100-night trial and a 10-year warranty, too. We wouldn't necessarily recommend it as an every-night mattress, but if you need a mattress for a spare bed and don't want to splash a load of cash on it, this is a fantastic option.

Best king size mattress for back pain

Press photo of the Nolah Evolution 15 mattress in a bedroom

(Image credit: Nolah)
A great king size mattress for supportive luxury

Specifications

Type: Hybrid
Materials: Memory foam, other foams, pocket coils
Firmness (1-10): 4-5, 6-7 or 8
Height: 15"
Trial: 120 nights
Warranty: Lifetime
Price bracket: Premium
Buy it if

You struggle with back pain: This mattress delivers excellent spinal support, making it a strong choice for anyone struggling with back pain.

You prefer a luxury feel: With its chunky, 15-inch tall profile and sumptuous Euro-top, the Nolah looks and feels luxurious.

You want to pick your firmness: Like the Saatva (#1), the Evolution is available in three firmness profiles, so you can pick the one that best suits your body type and sleep style. 

Don't buy it if

❌ You run hot at night: The Evolution can sleep warm on occasion. If you have an issue with overheating at night, the Saatva (#1) would be a better pick.

❌ You're on a budget: Despite regular discounts, this is a premium priced mattress. If it's out of your budget, check out the mid-range DreamCloud (#2).

The bottom line

🔎  The Nolah Evolution 15 proves a mattress can be supportive while still looking and feeling luxurious. It's available in three feels, so you can pick the one that suits your sleep style. It also delivers great motion isolation, but can sleep a little warm. ★★★★½

The Nolah Evolution 15 is a tall hybrid mattress that looks and feels luxurious, but also manages to deliver excellent support. It's premium in price, but a great choice for anyone suffering back pain or aches and pains, especially as you can pick your firmness level.  

Design
The Nolah Evolution 15 has a hybrid design that includes zoned and pocketed coils for targeted support, and foams for cushioning and pressure relief. It's topped off with a luxurious-feeling Euro-top, with organic cotton cover. At 15-inches tall, it's very thick, but there are handles to help with maneuvering. 

Comfort and performance
Like the Saatva Classic (#1), the Evolution is available in three different firmness levels. Choose between Plush (4-5 out of 10), Luxury Firm (6-7) and Firm (7-8). Those options enable you to tailor this to suit your sleep style, body type and person preference. Our reviewer tried the Firm version, and found it delivered excellent full-body support coupled with gentle cushioning. We'd recommend it to anyone suffering back or joint pain. 

We were also impressed with how well this mattress isolated movements, making it a good choice for anyone who shares a bed. The only slightly weaker aspect was temperature regulation; despite various features meant to aid in keeping the sleeper cool, our testers found this mattress could run warm on occasion. 

Value for money
The Evolution 15 sits in the premium price bracket, even factoring in the perpetual Nolah mattress sale, which knocks 35 per cent off MSRP and throws in two free pillows. Expect to pay around $1,750 for the king size. We think the quality justifies that cost, though. If you want to take that down a bit, you can opt to remove the 120-night trial period and pay $100 less. 

How to choose the best king size mattress

A good mattress should last for years, so it's important to make your choice wisely. Here are five important things to consider. 

Firstly, how firm do you want your mattress to be? Side sleepers and lighter people generally prefer medium to soft, while back and stomach sleepers and heavier people may prefer a firmer surface. Secondly, what kind of materials do you prefer? For example, some people love how memory foam 'cradles' your body, while dislike the feel of 'sinking into it'. 

Thirdly, think about how prone you are to getting hot at night, as some mattresses use special materials and/or designs to minimise this. Fourthly, how certain are you about your choice? If you're unsure, look for models with generous sleep trial periods. Finally, think about how much you wish to spend. A higher price doesn't always guarantee the best mattress, so prioritize features that align with your sleep needs. For more details, read our full article on How to choose a mattress.

What are the disadvantages of a king size bed?

King size beds have a lot to offer, but there are some potential downsides to consider. Firstly, tend to be more expensive than smaller bed sizes. They also require larger mattresses, frames, and bedding, all of which adds up. Secondly, they require a lot of space in the bedroom, so if your room is small, it may be tricky to move around with a king-size mattress in it. Thirdly, their large size means that if you need to relocate or rearrange your furniture, this kind of mattress is a pain to move around. Finally, cleaning and maintaining a king-size mattress and bed frame can be more time-consuming and challenging than a smaller model.

Tom May

Tom May is a freelance writer and editor specialising in tech, design and sleep products. Over the years he's tested a number of mattresses, duvets and pillows, and as a back pain sufferer, has a keen interest in finding ones that offer maximum support. Plus, in running a successful Airbnb business, sleep hygiene and providing the right bedding for guests has become a big part of his day-to-day life. He is author of Great TED Talks: Creativity, published by Pavilion Books.

With contributions from