【40D Cooling Gel Memory Foam】: 3 Inch Cooling Gel-infused Memory Foam Mattress Topper is made of 40D high-density aviation grade memory foam and gel-infused beads, more breathable to keep your body from overheating easily, and would maintain a cooler constant temperature than ordinary memory foams to improve your sleeping experience. Removable Bamboo Fabric Cover: Our mattress topper cover is removable and washable. The bamboo cover is equipped with skid-resistant surface mesh backing to prevent sliding and premium metal zipper for convenient disassembly and washing. Improve Sleep Quality: 3” memory mattress topper conforms to the curves of your body to relieve pressure and pain, allows air flow and provides a great night sleep.