The Craftsman Extra Firm is designed with a 2 prong temperature management system, featuring a cold cover that contains a thick layer of cooling Gel Memory Foam, and extra firm support layers, the Quilted top panel gives way to upholstery grade Extra Firm support materials underneath, right down to the H.D. individually wrapped coil Support system… the entire sleep system is designed to deliver extra firm support for those individuals requiring the firmest level of support.