Tencel® moisture-wicking cover for dryer, cooler sleep surface. Pre-stressed Supersoft Foam for added comfort. Pre-stressed Soft Foam for cushioning pillow top feel. Gel-Infused Memory Foam provides conforming pressure relief to eliminate tossing and turning. Pre-stressed Luxurious Foam for added comfort. Foam-Encased Innerspring Unit provides best in class design with uniquely conforming support. Hinged rails allow for added flexibility with adjustable bases.