Sleep Comfort 4-Inch Gel Memory Foam High Loft Topper with Waterproof Cover, Full 100% Polyester Made in US 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 Gel infusion draws uncomfortable warm air away from your body Open nature of textured side provides improved air flow Offers moisture control preventing fluids from penetrating the surface of the mattress topper Reduces tossing and turning for a deep, healthy night's sleep Memory foam is resistant to dust mites and is naturally antimicrobial