Slumber Solutions Gel Big Bump 4-inch Memory Foam Mattress Topper with Cover, Size King Originally designed for NASA, this space-age foam cradles your body, reducing pressure points that cause tossing and turning Improves circulation Temperature-sensitive foam adjusts to your body temperature Sculpted design provides improved air flow Includes 300-thread count Egyptian cotton cover with 17-inch skirt Eliminates motion transfer and uncomfortable pressure points Helps rejuvenate tired muscles and eases back pain Meets all flammability standards