Sleep in warmth and comfort with the Gracie Mills 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 a 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. Twin and Full sizes come with 1 controller and Queen and King sizes come with 2 controllers. Comes with manufacturer’s 5-year warranty.