Feeling renewed every morning is as simple as snuggling into your Serta Azure Bay 11” Firm Mattress every night. A unique combination of foam, gel foam, coils and fabric creates the firmness that helps back sleepers wake up feeling aligned. Plus, a layer each of PillowSoft™ and PillowSoft Aire™ Medium Comfort Foams provides the firm feel that accommodates a wide range of sleeping positions. Cool Twist™ Gel Medium Comfort Foam not only contours to bodies of all shapes and sizes and works in tandem with the stretch-knit cover and the breathable, natural rayon-blend underlayer for a hint of cooling