13-inch hybrid mattress with an ultra-plush feel, built to sleep cool. Springy ActivAir foam bounces back like latex while OmniPhase phase-change material absorbs and releases heat, and CoolSync foam contours with cooling gel. Zoned pocket coils add targeted support and motion control, while a HyperChill cover helps keep sleep cooler. The flexible base foam works with adjustable bases, and the CertiPUR-US certified foam arrives compressed, rolled and boxed. Covered by a 10-year warranty.