Restonic's Kimberley Extra Firm mattress features High Density Supportive Polyurethane Foam that surrounds 884 (Queen) Zoned, Individually Pocketed Coils to give you optimal comfort and support. One full layer of TempaGel™ Gel Infused Memory Foam caters specifically to your body for supreme comfort. The Soft-Cool Finish™ maintains a comfortable temperature and helps keep moisture away. The High Density Polyurethane and Soft Polyurethane Quilting Foams along with the Supported Convoluted Foam provide unbeatable firmness. Furthermore, the Superedge Plus™ and Marvelous Middle™ give you even more support. This mattress is ideal for stomach sleepers.