Best King Size Mattress (2021)


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So, you’re ready to upgrade from a queen size mattress to a king size. At 76 inches wide by 80 inches long, king mattresses are great options for sleepers who want a little extra space. Whether you sleep with a partner and want to spread out, need a larger bed to balance out a big master bedroom, or just prefer some extra surface area, a king mattress is a great option for you.

A king bed can be a big investment, so to help you find a high-quality mattress I’ve made a list of some of my favorite king size mattresses of the year. Use this list as a starting point, and then keep reading below to get some information on king mattress buying considerations.

Best King Size Mattresses — Top Choices Detailed

Below I’ll go into detail about my favorite king mattresses, which I’ve listed above. I’ll continue to update this list as I test and review new mattresses. Down at the bottom I have all of the best king mattresses compared in one handy chart.

Best King Size Mattress for Side Sleepers

The Helix Luxe Mattress

Helix Midnight Luxe

Helix is known for creating pressure-relieving mattresses for side sleepers. The Helix Midnight Luxe is an especially nice option for these folks. It’s zoned for pressure relief, which means it will be extra soft around the shoulders to prevent stiffness. And the Midnight Luxe includes two extra inches of comfort foam, which makes it even better than the standard Helix Midnight for side sleepers looking for plush pressure relief.

This medium-firm hybrid mattress also includes a breathable Tencel cover. This recycled material is a nice perk for both eco-friendly shoppers and hot sleepers. I’d highly recommend side sleepers interested in a king size mattress check out this Helix.

Learn more about the Helix Luxe line in our Helix Luxe mattress review.

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Helix Midnight Luxe

Helix Midnight Luxe

Whether you choose the standard or luxe edition, Helix mattresses have something to offer every style of sleeper! 

Best King Size Mattress for Back Pain

The Saatva mattress in the Sleepopolis studio.


If you struggle with back pain, the Saatva could be a great choice for you. This bouncy innerspring mattress offers firm support, which should help keep your spine in a straight line. This luxury mattress uses durable steel coils in its support layer, so it won’t start to sag early. A sagging mattress can exacerbate back pain. 

Saatva offers its classic mattress in three firmness levels, so most sleepers should be able to find a model that works for them. Combination sleepers should especially like the bouncy feel of this Saatva line. If you do suffer from back pain, I’d suggest opting for one of the firmer models

This high-quality king mattress is worth the investment. You can learn more about it in our full Saatva mattress review.

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Saatva Mattress

Saatva Mattress

The Saatva mattress combines a luxurious pillow-top layer with two sections of coils for that classic innerspring feel. 

Best King Size Memory Foam Mattress

The Layla mattress in the Sleepopolis studio.


If you’re on the hunt for a king size memory foam mattress, the Layla could be the best mattress for you. This bed-in-a-box mattress is flippable, and features a soft and a firm side. The soft side of the Layla is a great option for side sleepers looking for pressure-relieving sinkage and body-contouring. The firm side of the Layla is a nice option for back sleepers who enjoy the body-contouring feel of memory foam.

This Layla is also a nice choice for couples. Its memory foam layers cut down on motion transfer, meaning you won’t feel disturbed by a restless partner on this bed. This Layla is also a fairly affordable option for folks looking to purchase a new king mattress.

Interested in the Layla? Learn more in our full Layla mattress review.

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Layla Mattress

Layla Mattress

A flippable design makes the Layla mattress a truly customizable bedroom accessory. 

Best King Size Mattress for Couples

The WinkBed in the Sleepopolis Studio.


If you’re on the hunt for a king size mattress that will appeal specifically to couples, the WinkBed might work for you. This pillow top hybrid mattress is a great match for back and stomach sleepers who like a firm feel. It’s bouncy and supportive, which are nice perks for sex.

Another great feature of the WinkBed is that it offers great edge support, which means couples can use the entire surface area of this mattress without feeling like its sides might collapse. Which means your new king mattress will feel even bigger!

And finally, the WinkBed’s cooling gel-infused comfort foams won’t trap body heat. This helps to dissipate the added body heat you get from having two sleepers in a bed, which means the WinkBed should sleep nice and cool.

Find out more about this mattress in our full WinkBeds Mattress review.

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WinkBeds Mattress

WinkBeds Mattress

Built with a plush pillow top and a buoyant coil-on-coil structure, the WinkBeds is a great option for a wide range of sleepers! 

Best Soft King Size Mattress

The Nectar mattress.


If you’re on the hunt for a soft mattress, the Nectar is a great choice for you. Built with thick layers of gel memory foam, the Nectar offers tons of plush sinkage that memory foam lovers should appreciate. This all-foam mattress is an especially nice choice for side sleepers, who will get the pressure relief they need from this bed.

The Nectar is also a great value bed. Like most foam beds, it’s one of the less pricey options on my list. I’d recommend folks looking for a soft king mattress that won’t break the bank check it out.

You can learn more about the Nectar in our full Nectar mattress review.

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Nectar Mattress

Nectar Mattress

Sleepers will sink deep into the Nectar mattress for some soothing pressure relief, something that side sleepers will particularly appreciate! Click here to get $399 of free accessories with every mattress purchase!

Best King Size Mattress for Back Sleepers

The Leesa original in the Sleepoplis studio.


It’s a good idea to tailor your mattress choice to your sleeping position. If you’re a back sleeper, the original Leesa mattress could be a great choice for you. This medium-firm mattress offers a nice mix of pressure relief and support for these folks. It should keep your spine neutrally aligned (read: straight) while you’re on your back.

The Leesa uses a breathable foam in its top layer, which means this mattress will sleep nice and cool. So hot sleepers on the hunt for a king bed might like this Leesa.

Take a look at the full Leesa mattress review to learn more about this bed.

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Leesa Mattress

Leesa Mattress

  • Great for Back Sleepers
  • Sleeps Cool

Best King Firm Size Mattress

The Bear mattress.


If you’re looking for a firm mattress the original Bear might be a nice choice for you. This firm mattress offers great support for back and stomach sleepers. These folks need firm support to keep their hips lifted up in line with their shoulders. The Bear fits this bill, but still offers a bit of nice body-contouring.

Another great perk of this Bear is that it’s built with temperature regulation in mind. Its cooling cover and graphite-infused foams should keep you sleeping cool throughout the night. If you’re a hot sleeper on the hunt for a firm mattress, I’d recommend checking out the Bear.

Learn more about this bed in our full Bear mattress review.

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The cover of the Bear mattress uses celliant, which some studies suggest may help those with active lifestyles recover faster! 

Best King Size Pillow Top Mattress

The DreamCloud Premier in the Sleepopolis bedroom.

DreamCloud Premier

If you’re on the hunt for a king size mattress with a plush pillow top, the DreamCloud premier could work for you. This mattress’s gel foam comfort layer rests below a quilted cover and euro top, so it has a super soft feel. But its pocketed coil support layer and high-density foam base layer mean the DreamCloud still offers great support. I’d especially recommend this 15-inch mattress to side and back sleepers looking for extra cushion around their pressure points.

The DreamCloud also offers great motion isolation and edge support, so it could be a nice option for couples. You won’t feel overly disturbed by a restless partner on this DreamCloud, and you’ll really be able to spread out over the entire mattress.

Check out the full DreamCloud Premier mattress review to learn more about this bed.

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DreamCloud Premier

DreamCloud Premier

This tall hybrid mattress combines foams with pocketed coils for a luxuriously supportive sleeping experience. Get $200 off a DreamCloud mattress plus free pillows, a mattress protector and a set of luxury sheets ($399 value) with your purchase!

Best King Size Mattress Under $1000

The Sealy Cocoon

Sealy Cocoon Chill

If you’re looking to score king mattress benefits without the king mattress price tag, Sealy’s Cocoon Chill mattress might be a nice choice for you. Sleepopolis has tested the firm version of the Cocoon Chill, which offers a two-inch memory foam layer. This bed is a nice fit for back sleepers looking for a bit of body-contouring. Sealy also offers a soft version of this mattress that might be a nice fit for side sleepers.

Like the name suggests, the Cocoon Chill sleeps cool. It has a breathable cover that works to diffuse any trapped body heat. So I’d recommend hot sleepers on a budget check this mattress out.

Learn more about this value buy in the full Cocoon Chill mattress review.

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Sealy Cocoon Chill

Sealy Cocoon Chill

The Cocoon Chill is Sealy’s all-foam mattress that offers a memory foam comfort layer to provide a contouring feeling as you sink in for pressure relief.

Best Cooling King Size Mattress

The Casper Original Mattress.

Casper Original

Casper mattresses are quite popular in the online mattress market, and I’m a fan of the Casper Original for anyone looking for a cooling king size bed. The Casper uses aerated, open-cell foam in its construction to encourage breathability throughout the structure. So hot sleepers should feel comfortable on this bed.

Another nice perk of this Casper is that its layers of foam are all CertiPUR-US® Certified, which means they’re free of any harmful chemicals or heavy metals. If you’re concerned about avoiding irritants in your mattress, I’d suggest taking a look at the Casper.

I’d recommend this firmer-feeling mattress to back sleepers, especially those who suffer from back pain. The Casper uses a zoned support system, which means it offers a little extra lift around the hips and lower back. This might be a nice way to help alleviate lower back pain for some sleepers.

Interested in this bed? Learn more in our Casper mattress review.

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Best Cooling King Size Mattress

Best Cooling King Size Mattress

The memory foam, latex, and heavy-duty poly foam work together to offer sleepers a beautifully balanced feel! 

Picking a King Mattress: Buying Considerations

While you can’t go wrong with any of the king mattresses on this list, I’ve included a few tips below that could help you choose the best type of mattress for your body type and sleep needs. You can also check out our mattress buying guide for more in-depth information.

Mattress Materials

Latex mattress construction

You should choose your mattress type based on your body type and preferred sleeping position. Take a look at my list below to learn a little about the main mattress types and who they might be best for.

  • Foam mattresses  Foam mattresses can be made out of a variety of foam materials, including memory foam and polyfoam. These beds are made with a layer of support foam that supports the sleeper (rather than a layer of support coils). These beds can vary in feel, so most sleepers can find a foam mattress that works for them. However, I’d steer heavier sleepers or folks looking for a lot of durability towards hybrid or innerspring beds.
  • Hybrid mattresses Hybrid mattresses are made with a combination of foam comfort layers and coil support layers. These mattresses often feel bouncy and responsive. Many different sleepers should be able to find a hybrid mattress that works for them, as these beds vary quite a bit in feel.
  • Latex mattresses Latex mattresses are made with latex foams. They’re bouncy, naturally cooling, and very durable. Latex is often used in organic mattresses, like the Avocado Green mattress. I’d recommend latex mattresses to hot sleepers who enjoy springy support.
  • Innerspring mattresses This traditional mattress type relies on a steel coil support system. Most classic brands you’d find in brick-and-mortar stores make innerspring beds. These beds feel bouncy and supportive, and are great options for heavy people, combination sleepers, and seniors.

Firmness and Feel

How a bed feels is one of the most important buying considerations for any new mattress. Beds can range from firm to soft, but depending on your sleeping position and body type you’ll have different firmness needs. Take a look at the list below to learn which feel is best for you. And check out our mattress firmness guide for more in-depth information about choosing a mattress firmness level.

  • Side Sleepers — Side sleepers normally do best on a soft mattress that offers plenty of pressure relief around their shoulders and hips. It’s common for these folks to feel sore in these areas when they sleep on a firmer bed. I’d recommend these folks check out pillow top and memory foam mattresses.
  • Back Sleepers — These sleepers do best on medium-firm to firm mattresses. They need enough support to keep their hips neutrally aligned with their shoulders, but can also benefit from some body-contouring around the lower back.
  • Stomach Sleepers — These sleepers need a firm to extra-firm mattress that prevents their hips from sinking into the bed. Bowing at the back can lead to pain over time, so stomach sleepers should pay special attention to finding firm support. I’d recommend these folks check out latex and innerspring mattresses.
  • Combination Sleepers — Combination sleepers often do best on medium-firm mattresses that offer appropriate support in multiple sleeping positions. These sleepers’ primary concern should be finding a responsive mattress that makes it easy to change positions throughout the night.
  • Heavy Sleepers (over 250 lbs) — I wanted to include a special note about heavier sleepers here, because these folks will often find mattresses softer than light or average-weight sleepers. Because of that, I’d recommend they look for firmer mattresses that offer a lot of durable support. Our best mattresses for heavy people roundup might help these folks find a good fit for their needs.

Warranty, Shipping, and Sleep Trial

A few other things to consider when buying a new mattress are its warranty, sleep trial period, and shipping costs. A lot of online mattress brands offer free shipping, and mattresses will often arrive compressed in a box. Other brands, like Saatva, may offer free white glove delivery, which means they’ll deliver the mattress to your room of choice.

Warranty and trial-period length can also weigh into a buying decision. I’d recommend opting for a mattress with at least a 10-year warranty and a 100-night trial, if not longer. Some companies offer lifetime warranties and year-long sleep trials, so definitely take a look at company policies before deciding on a new bed.

King vs California King Mattresses

We get a lot of questions here at Sleepopolis about the difference between a king and California king bed. A standard king size mattress is 76 inches wide x 80 inches long, while a California king is 72 inches wide x 84 inches long. So you’re sacrificing some width for extra height on a California king. If you’re especially tall, you might prefer these dimensions.

A California king is the longest mattress size available, so if your main priority is mattress length, this is definitely the size you’ll want to opt for. Additionally, you can look for a mattress with great edge support (like the Saatva), to compensate a little for the loss of width. On the other hand, if you prefer extra width or like a more square mattress look, you’ll probably prefer a standard king size mattress.

King vs Split King Mattresses

Loom & Leaf foundation - King size (split Twin XL's)A look at a split king setup.

If you sleep with a partner who has very different sleep preferences from you, you may want to consider a split king mattress. A split king is the same size as a traditional king mattress, but it’s made of two twin XL mattresses placed side by side. Split kings are great options for couples with different sleep preferences, or couples of different weights. Each side can be customized to meet your individual sleep needs, so a light side sleeper and a heavy stomach sleeper can share a bed and still get the support and pressure relief they each need.

Split kings are also compatible with adjustable bases, which could be another reason to consider this mattress option. These beds are compatible with other bed frames too, so are still a nice choice even if you prefer a less high-tech frame.

Is a King Mattress Worth it?

So is a King mattress a sound investment? Take a look at some of the pros and cons of these beds to decide!

King Mattress Pros

  • King mattresses offer more sleeping space, which can be especially nice for couples.
  • If you’re a restless sleeper, you’ll have plenty of room to toss and turn on a king without disturbing a partner or falling off the bed.
  • Taller or heavier sleepers might really appreciate the extra space a king mattress offers, especially if they often wake up with their feet hanging off the side of the bed.

King Mattress Cons

  • King size mattresses are significantly more expensive than other mattress sizes. Sheets, bed frames, and other accessories will also be pricier, so cost could be a deterrent for many people.
  • If you have a smaller bedroom, a king mattress could be too large for your space.
  • King mattresses are heavier than other mattress sizes, so may be harder to move, especially if you don’t have help.

Best King Mattress: Details and Pricing

Here is one last look at all coupons and information you need to choose the best new king mattress for you:


Are king mattresses square?

No, king mattresses are rectangular at 76 x 80 inches.

Are king mattresses better for couples?

It depends on your preferences! King mattresses are larger, so couples who like to spread out may prefer the additional space. Heavier couples might also appreciate the additional space and support a king size bed offers.

Do all king mattresses have a ridge in the middle?

A ridge, or hump, commonly develops in the middle of king mattresses because it’s uncommon for solo sleepers or couples to sleep in the center of these large beds. To avoid a “king’s ridge,” you can make it a point to spend time in the center of your mattress while awake, add a topper, or choose a solid foundation or box spring with a center support beam for your mattress.

Is there a bed size bigger than a king?

Yes, there are a few larger bed sizes. Alaskan king mattresses and Texan king mattresses are 8 to 32 inches wider than a standard, or Eastern, king mattress. And Emperor size mattresses are 80 x 80 inches, making them the mattresses with the largest surface area on the market today.

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Madison is the Staff Writer at Sleepopolis. She reviews new mattresses every week to help readers decide which mattress is best for their needs. When she’s not testing out a bed or trying to fit in at least nine hours of sleep you can find her exploring a new park, reading short stories, or checking out a local brewery.


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