Sleep in warmth and comfort with the Beautyrest 100% Cotton Heated Mattress Pad. Using Secure Comfort Technology, this electric mattress pad features 20 heat settings that provide maximum warmth and comfort as well as an adjustable 1-10 hour shut-off timer for safety. The 100% polyester and hypoallergenic filling offers soft and clean comfort, while fitting mattress up to 21-inches deep. Virtually eliminating magnetic field emissions, this heated mattress pad is machine washable and provides excellent warmth, comfort, and safety through the night.