Beautyrest 3-inch Sculpted Gel Memory Foam Mattress Topper-Cal King.This Mattress Toppers Is a Gel Memory Foam Mattress Toppers. You Should Use This with Your Beddings and on Your Mattresses.it Is Not a Mattress Cover,foam Mattresses or Memory Foam. Temperature sensitive foam adjusts to your body temperature Draws uncomfortable warm air away from your body Eliminates motion transfer and uncomfortable pressure points Helps rejuvenate tired muscles and eases back pain Meets all flammability standards