Sleep Comfort 3-Inch Gel Memory Foam High Loft Topper with Waterproof Cover, California King 100% Polyester Made in US Helps relieve pain in feet, legs and lower back Top surface fabric is same material used as upholstery in fine homes, on yachts, and in high-end automobiles Wipes clean with mild soap and water Bottom material with enhanced traction and with additive to fight mold and mildew on the mat Designed and assembled with pride in the USA Originally designed for NASA this space age foam cradles your body, reducing pressure points that cause tossing and turning Draws uncomfortable warm air away from your body Polyester knit fabric cover features an air-permeable backing that serves as a moisture barrier Textured foam design provides additional air flow for maximum comfort Memory foam is resistant to dust mites and is naturally antimicrobial