This low-voltage heated mattress pad is the safest available because it only uses 18 volts of power, unlike other pads that require up to 120 volts, yet it provides consistent warmth without hot or cold spots in as little as 15 minutes. It automatically shuts off in 10 hours, and the control has easy-to-read numbers and a simple on/off switch, and dual controls on King and Queen models, allowing you to customize heating for either side of a bed. The removable, 100% polyester velour pad cover has a stretch skirt that fits mattresses up to 18" deep. Machine wash and dry. Full. 75" L x 54" W. (3 1/2 lbs.)