The Hemmons mattress is the only all-foam perfect sleeper model to combine an extra-plush layer of Serta’s cool action gel memory foam and Ever Cool memory foam for the ultimate in cooling, pressure-relieving comfort. It is designed with a unique set of features to help solve 5 common sleep problems: 1. Helps reduce tossing and turning with cool action gel memory foam and Ever Cool memory foam 2. Encourages proper back support and alignment with the comfort last foam core 3. Promotes a balanced sleep temperature with cool balance technology 1. Minimizes impact from partner movement with our True Sense motion-isolation design 4. Resists sagging and edge roll-off with Serta’s ultimate edge foam encasement this mattress also features an ultra-plush layer of Serta’s Pillow Soft foam for gentle cushioning and is compatible with a Serta adjustable foundation, including the pivot head-up and motion essentials ii models.