The Best King Size Mattresses of 2024 (Reviewed & Compared)

The Puffy Lux is a fantastic option for sleepers who enjoy a “deep hug” of memory foam, which contours to their body curves. The mattress is made up of four foam layers and contour-adapt coils, which provide a good level of spinal support and pressure relief.

Thanks to memory foam, it conforms to a sleeper’s body in all sleeping positions. However, since it’s a bit on a softer side, we wouldn’t recommend it to stomach sleepers.

Besides exceptional comfort, the Puffy Lux performs great when it comes to motion isolation. That’s probably one of the reasons why it’s so popular among couples.

Also, you should know that all the foams are CertiPUR-US Certified, meaning they don’t contain any toxic chemicals. Another proof that Puffy is using only high-quality materials is its lifetime warranty. This clearly shows that the manufacturer strongly stands behind its products.

If you’re looking for the best value for your money, Amerisleep AS3 might be a great option. This mattress offers a medium-firm feel, meeting the needs of most sleepers. However, if you prefer a softer or firmer feel, Amerisleep offers four more models, so you should check them out.

AS3 features three foam layers, which are designed to provide both excellent support and pressure relief. Thanks to its targeted support technology, the mattress will keep your spine properly aligned without causing additional pressure to your hips and shoulders. Therefore, it’s an excellent pick for side sleepers.

Being an all-foam bed, AS3 isolates motion pretty well. So, if your partner is a restless sleeper, you won’t have to worry about all that tossing and turning. Also, it has pretty solid edge support when compared to other foam mattresses.

Another cool option for couples is a split king mattress, especially if you’re using an adjustable base. This way, you and your partner can each adjust the base according to your needs.

This young company, which was founded only a couple years ago, has quickly become established in the competitive mattress-in-a-box industry. If you’re a memory foam fan who prefers mattresses with a deeper hug, the Nectar is the right choice for you. 

We believe people with lower back pain will find this memory foam mattress exceptionally comfortable. This is because the mattress provides great support and some nice cushioning at the same time. We’d recommend it to back and side sleepers, while stomach sleepers typically need less sinkage.

Since the Nectar uses a Tencel cover and gel memory foam in its first layer, it sleeps cooler than most foam mattresses. Therefore, it’s a good option even for hot sleepers. Couples will also be happy to hear that this king size mattress absorbs motion very well.

Considering that the manufacturer offers an entire year to test your mattress, there’s really no risk in giving it a try. What’s more, the Nectar comes with a lifetime warranty, which should give you peace of mind if you decide to buy it.

Nuvanna is still rather new in the mattress-in-a-box market. Nevertheless, it offers an amazing mattress at a very affordable price.

It’s an all-foam mattress, which has a medium-firm feel. As you will see below, people often choose different firmnesses depending on their preferred sleeping position. While stomach sleepers might be looking for the best firm king size mattress, this all-foam mattress will suit most side and back sleepers.

The Nuvanna mattress is comprised of three layers that are designed to provide maximum comfort. The high-density polyfoam in the base layer provides great support, while the memory foam and gel-infused polyfoam in the comfort layer allow for some nice pressure relief. The mattress is topped with a Tencel cover, which is very soft and breathable.

Even though the construction of the mattress is made of different types of foam, the bed has a pretty good temperature regulation. Also, if you or your partner is a light sleeper, you should know that this king size mattress might be a great pick because it isolates motion very well.

The good news is you can test this mattress at home for more than three months and then decide if you like it or not. Even better, it comes with a 10-year warranty.

Casper is one of the most renowned mattress brands in the industry. It offers four mattress models—the Wave, the Nova, the Original and the Element. However, the Casper Original probably sells the most since it offers great comfort for a reasonable price.

In its original version, it consists of four layers designed to keep the body in perfect alignment without adding additional pressure to sensitive points, such as the hips and shoulders. This is why it’s a great pick for side sleepers, although back and stomach sleepers won’t be disappointed either. Its versatility is just one of the factors which make it our top choice overall.

In fact, it boasts a Zoned Support foam that provides exceptional support to your back, while allowing pressure relief for your hips and shoulders. Many customers praise this feature since it relieves their aches and pains, and helps them have a great night’s rest.

Furthermore, the Casper has excellent motion transfer, which makes it perfect for couples. However, if you’re on the heavier side, we’d recommend opting for a hybrid version because springs offer stronger support. Casper also offers king size bedding that will perfectly fit your mattress.

Live and Sleep offers three all-foam mattresses. Although each has its advantages, we believe that the Luxury Mattress is Live and Sleep’s best because it suits so many sleepers. It’s medium-firm, so most customers are satisfied with the feel it offers. Under its soft breathable cover, the mattress consists of three foam layers, which all work together to provide exceptional comfort. 

On top of that, there’s minimal sinkage even though it’s a memory foam mattress, so combination sleepers can easily change their positions during the night. Thanks to its great support, the mattress will keep your body in perfect alignment, while its top memory foam layer contours to your body shape and provides pleasant pressure relief.

It’s also great that it absorbs motion pretty well, so couples are able to have a great night’s sleep even if one of them is a restless sleeper.

Although Live and Sleep’s Luxury Mattress isn’t a cheap mattress, it is one of the few affordable king size mattresses that can boast such a luxurious look and feel. If you’re still having doubts, keep in mind that this manufacturer offers a 100-night trial during which you can test the mattress out and return it if you’re not satisfied. In addition, the mattress is covered by a 20-year warranty, which isn’t a small thing.

Saatva is another company well-known for its luxurious mattresses. Thanks to its quality and reasonable pricing, the Saatva Classic mattress has become very popular in the mattress-in-a-box world. Thus, it has easily earned a place on just about any list of the most comfortable mattresses. 

This innerspring model consists of three layers: two different types of coils separated by foam and a Euro pillow top. Its “coil-on-coil” technology makes the mattress extremely supportive, so it will keep your spine in proper alignment no matter your sleeping position.

We also like that the mattress cover is made of organic cotton. Besides being soft to touch, it’s very breathable, which promotes good airflow.

This luxurious pillow top mattress comes in three firmness levels and two thickness options, which you can choose between depending on your sleeping position and any other sleeping preferences. It’s amazing that you can personalize your mattress at no additional cost. With this in mind, we can say that Saatva offers the best prices in the luxury category.

While the Saatva mattress excels at temperature regulation, it isn’t that good at isolating motion. We’d say this is somewhat expected since innerspring mattresses are bouncier than foam mattresses. While we wouldn’t recommend this mattress to light sleepers, it’s a great choice for those whose main priority is a healthy sex life.

Nest Bedding is a well-established mattress-in-a-box company that was founded in 2011. It has been doing well on the market for a while now, and for good reason. It offers a wide range of mattresses, all of which are made of high-quality materials.

The Alexander Signature Hybrid is made of five layers, which are all there to make you comfortable and help you have the best night’s sleep. 

The combination of coils and foam layers has a number of benefits. While innerspring mattresses don’t perform so well when it comes to motion transfer, this hybrid mattress absorbs motion pretty well thanks to three foam layers that are placed on top of pocketed coils.

Therefore, both you and your partner can enjoy undisturbed sleep even if one of you tends to sleep restlessly. What’s more, you can use the entire sleep surface without a fear of slipping off the bed thanks to excellent edge support.

In addition, the Alexander Signature Hybrid mattress has great temperature regulation, for two reasons. First, the coils improve the airflow, and second, the foam layers are infused with copper and a cooling gel. All this makes it a solid pick for hot sleepers.

This great king size mattress comes in three firmness options, so you can choose the one you like most. What’s more, Nest Bedding offers an internal split option, which is the best option for couples whose preferences differ greatly.

And don’t forget that Nest Bedding’s mattresses come with a lifetime warranty.

The Leesa mattress is made of three types of foam, which are designed to support and align the body in all sleeping positions. Thanks to its special foam in the top layer and memory foam in the recovery layer, this mattress is very comfortable.

We believe it’s especially good for stomach and back sleepers, who don’t enjoy too much sinkage. However, even though these two premium top layers allow for pressure relief, some side sleepers find the mattress a bit on the firm side.

The great news is that the Leesa mattress minimizes motion transfer, so couples can sleep peacefully without worrying that they’ll wake each other up if they tend to change their sleeping positions. It’s also quite breathable, especially for an all-foam mattress. Plus, the cooling foam top will keep you cool throughout the night.

Besides using quality materials and offering great comfort, Leesa is special for other reasons as well. This mattress company donates a mattress to a shelter for every ten it sells. It also plants a tree whenever it sells a mattress. It’s amazing to participate in their honorable goals.

Tempur-Pedic offers a variety of high-quality mattresses, so most sleepers can find the feel they prefer. Its most popular model is Tempur-ProAdapt, which we believe is a great choice for couples.

It’s a luxurious all-foam bed, which offers great pressure relief and spinal support in all sleeping positions. The Tempur-ProAdapt comes in three firmness levels, so depending on your sleep needs, you can opt for a soft, medium, or firm feel.

Since foam layers absorb motion pretty well, you don’t have to worry you’ll wake up your partner if you have a restless night. Usually, this is one of the most important features for couples. Also, this mattress provides decent edge support.

However, if you tend to use the entire bed surface, we recommend you get a hybrid version of this bed. In addition, the hybrid option has better temperature regulation because coils promote air circulation. Finally, this is also a great pick for heavy people since it offers ample support.