The Sleep Master 11" Memory Foam and Spring Hybrid Mattress provides the best of both worlds - the comfort of a memory foam top layer with the support of a traditional spring coil base layer. A plush sleep surface, the first feeling you have is lush memory foam. The Coil Spring core supports the body for years of deep, comforting sleep. This technology offers luxury and durability for a restful, restorative sleep. Coil springs on the Sleep Master 11" Memory Foam and Spring Hybrid Mattress provide better motion separation for an undisturbed rest.