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The Best King Size Mattresses of 2025, Tested and Reviewed by CNET’s Sleep Experts


Our sleep experts have been testing mattresses, bedding and accessories for years (a few have been testing for up to eight years). So far, we’ve tested more than 300 mattresses from many brands, from big brands like. Purple and Tempur-Pedic to many niche companies such as Sonu and Airweave.

Our team is made up of bed testers with different body weights and shapes, heights, genders and sleep habits, which allows us to thoroughly evaluate each mattress from different perspectives. Most mattresses are tested over a long period of time, ranging from a a month or two until five years.

We test large mattresses like we would any other bed. When the new mattress arrives at our home testing groundit is rigorously tested, functional by each of our experts. We analyze the unique features, including firmness, feel, warmth, insulation, edge support and other unique features that a mattress can have.

Stability

Firmness is rated on a scale of 1 (very soft) to 10 (very firm), and we use industry terms such as soft or firm to describe it. Our entire team takes turns evaluating the firmness of each mattress, allowing us to make recommendations about the sleeping position and body type it’s meant to be. After a thorough analysis of the firmness, we let our one-of-a-kind Mattress Smasher 9000 do what it wants and give us a firm grip.

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A close-up of the Mattress Smasher 9000 in action.

Aly Lopez/CNET

Listen

Another thing we look at is the feel of the mattress, as opposed to its firmness. Does it feel pale and sensitive while sleeping on it? Is it easy to change location? Or does a mass of memory foam contract around our bodies and temporarily hold our shape? Is the mattress soft, smooth pillow top feelingor are they neutral? Can we hear circular or partial support? We try to describe exactly what it feels like to sleep on each bed to help you determine if it’s right for you without having to try it yourself.

Read more: Why Foam in Your Mattress Matters

Heat

Temperature can be difficult to assess considering each sleeper’s preferences and the fact that many mattress brands overestimate their beds’ cooling power. When we test and evaluate a mattress, we describe in detail how the mattress sleeps in hot or cold conditions. Many external factors come into play here (such as weather and environment, bedding, bedding, etc.), so we test beds in temperature-controlled rooms without sheets or blankets. Using our extensive knowledge and experience, we analyze its design and materials and explain how it affects heat.

Isolation

WinkBed privacy

Testing the isolation of the WinkBed mattress with a cup of water.

Dillon Lopez/CNET

Isolation is a word we use to describe how well a mattress absorbs movement on it. It is especially important for light sleepers or those who share a bed with friends or pets. We test his isolation skills by having one expert lie on the bed while the other rolls over and changes positions. The second method is to put a glass of water on the edge, roll it away from it to see if the glass is straightening or falling.

Edge support

Edge support is usually not as important for full-size mattresses as it is for smaller ones such as queens or twins. Regardless, testing the edge support allows us to see how it works and supports the circular motion. We sleep on the edge to see how the bed responds. Does it allow and suggest that we can let go, or is it strong and supportive? We also push the edges with our fists to see how the edges push down.

Special

Some brands have special features in their mattresses, such as cooling covers for hot sleepers or support for those with back pain. We test and review these additional features and determine which sleepers will benefit the most.





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