The Kellner mattress features an extra-plush layer of Serta’s cool action gel memory foam, the world’s first premium memory foam infused with the support and cooling touch of Serta’s Micro Support gel – now available for the first time in perfect sleeper. 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 2. Encourages proper back support and alignment with the comfort last foam core 3. Promotes a balanced sleep temperature with cool balance technology 4. Minimizes impact from partner movement with our True Sense motion-isolation design 5. Resists sagging and edge roll-off with Serta’s ultimate edge foam encasement this mattress also features a 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.