Best King-Size Mattresses for 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). At this point, we've tested over 300 mattresses from dozens of brands, from bigwigs like Purple and Tempur-Pedic to more niche companies like Sonu and Airweave. Our team is comprised of bed testers with varying body weights and types, heights, genders and sleep preferences, which helps us provide an overarching assessment of each mattress from a multitude of viewpoints. Many mattresses are tested for long periods, ranging from a month or two up to five years. We test king-size mattresses just like we would any other bed. When a new mattress arrives at our testing facility, it undergoes rigorous, hands-on testing by each of our experts. We analyze specific characteristics, including firmness, feel, temperature, motion isolation, edge support and other special features the mattress may have. Firmness Firmness is rated numerically on a scale of 1 (the soft ... Read full article.