The 7 Best King Mattresses of 2020

If you’re shopping for a king mattress online, it won’t be long before you come across the Tuft & Needle Adaptive Foam Mattress. This mattress carries a trio of certifications to protect consumer safety and the environment. It also aims to help you sleep cooler and more comfortable, thanks to its unique foam composition.

A common complaint with memory foam is that it’s hot and stuffy and makes it hard to move around. Tuft & Needle aims to solve these problems with a unique, proprietary open-cell foam that is supportive but won’t suck you in. To keep you sleeping cool and comfortable, this adaptative foam contains a mix of graphite and gel beads for better temperature regulation.

The Tuft & Needle king mattress is constructed of 7 inches of support foam certified to be free of PBDEs, heavy metals, phthalates, formaldehyde, and other carcinogens or harmful substances. On top of this support layer is a 3-inch layer of adaptative foam for your comfort. It’s worth noting that hardly anyone complains of a chemical smell when unboxing this mattress.

Tuft & Needle does recommend giving this mattress a break-in period. It may initially be firm, but it will provide softer support after a week or more of use. Those who were dissatisfied with the mattress cited a loss of support in the spot they sleep in, but other people have been using this mattress for many months or years with no complaints. Overall, the Tuft & Needle king mattress earns a lot of praise for its unique foam and environmental certifications, combined with a comfort level that works for most people seeking a good night of sleep.

If you're willing to spend more money on your mattress, the Sleep Master Spring Mattress is a popular choice. Described as being ‘firm with some give’ by reviewers, most people find this mattress to offer plenty of support with enough cushion to be comfortable for a solid night of sleep.

The Sleep Master iCoil Spring Mattress is constructed with hundreds of individually pocketed coils to minimize motion transfer. To minimize pressure points and provide support, the iCoil Spring Mattress is finished with two layers of comfort foam and another layer of high-density support foam. When compared to other mattresses, many people agree that the support foam layer in this mattress does a great job of maintaining the firmness and support of this bed. The pillow-top is soft enough for most people, but if you’re looking for an extra-plush feeling, you might need to add a separate topper.

We like that this king-size mattress comes with a metal box spring, which is unique for many of the bed-in-a-box mattresses available online. Just unpack the box spring which springs into place easily, then allow the mattress to expand for up to 48 hours before laying your head down for a good night of rest. This mattress comes highly recommended from people looking for an easy-to-assemble and comfortable bed.

If you want a firm but comfortable mattress without spending a huge amount of money, you should check out the Classic Brands Serena Pillow Top Innerspring Mattress. This 10-inch mattress features independently encased steel coils that are 8 inches high, topped with two inches of cushion for a snooze-worthy surface. Keep in mind that this model is a conventional spring mattress and not a memory foam mattress. If you’re a fan of the spring and support offered by a coiled mattress, this mattress delivers.

For those that live in an apartment or have smaller hallways, the company has figured out a packaging process that allows this mattress to be roll-packed and delivered to your door in a compact box. It will quickly expand after shipping and be ready for use within a day or two.

Save some cash without skipping shut-eye with this king mattress. With plenty of support and a 10-year limited warranty, the Serena Pillow Top Innerspring Mattress is a great choice for a budget king mattress. 

Make no mistake about it, this is a firm king mattress that delivers on its promise to give you a solid sleeping surface. This 8.5-inch thick king mattress is an innerspring mattress that is topped with Sealy support foam to keep you from feeling the 400-plus coils inside the mattress. It’s described by users as firm yet supportive, but not as hard as sleeping on the floor. If you ask for firmness in a king mattress, this is what you want. Users that moved over from a memory foam mattress looking for more support or people plagued with back problems were very satisfied with this tight top king mattress.

The only common complaints about comfort are from people who weren’t prepared for a firm mattress and found it be too hard. Side sleepers may also find it to be uncomfortable since there is little give for shoulders. However, this king mattress is a great choice for back and stomach sleepers, who seem to enjoy this the firm sleeping surface and tight top.

Get the support of an innerspring mattress combined with the softness of foam with a hybrid king mattress, like this version from Olee Sleep.

The Omega Hybrid mattress has a unique 5-layer construction that gives this mattress a lot of support for some serious zzz’s. In addition to the 7.5-inch pocketed springs (which sit on top of a .25-inch base foam), this mattress has 3 inches of supportive foam—with the top inch being a cooling gel foam. It’s worth noting that the springs are individually pocketed to reduce motion transfer—an important factor to consider if you’re sharing your mattress with someone else.

People find this mattress to be super comfortable and it’s popular with people replacing traditional spring mattresses that aren’t ready to commit to a solid memory foam mattress. One of the most common complaints is the lack of edge support, but that’s typical for foam topped mattresses.

Side sleepers need a mattress that is supportive, yet soft enough to cradle their shoulders and neck. The Casper Essential is the company’s budget-friendly line, but it strikes a good balance between a soft and firm feel and is a big win for the side sleepers that have tried it.

The Casper Essential king mattress is constructed with 3 layers of foam—a supportive base layer, contouring memory foam middle layer, and soft open cell foam on top. The top layer of open cell foam helps to dissipate heat and keeps you sleeping cooler while offering enough give to let the shoulders and hips settle into the mattress.

One common complaint is that this mattress is on the thin side—Casper states it’s 8.5 inches thick, but several people claim it doesn’t measure up in real life. Despite this, an abundance of side sleepers love the mattress for its soft feel but incredible body support. If you’re searching for a king mattress for side sleepers, the Casper Essential is one to try.