Combining innovative foam material and innerspring technology in a hybrid design, the Sealy Posturepedic Premier Knightwick offers the best of advanced comfort and support. In the top half of the mattress, thick layers of cooling gel memory foam offer body-conforming support and cushioned comfort. On the lower half of the mattress, the Sealy Embrace Premier Coil system is specially engineered to deliver precise, exceptional support. The CoreSupport Premier Center places SealyConform Gel Memory Foam and 20 percent more coils in the center third of the mattress, where the majority of your body weight is centered. And reinforcing the entire mattress perimeter is the SolidEdge HD Premier System, providing maximum usable sleep surface space. 10 Year Non-prorated Warranty.