Sunbeam MSU4BKS-D000-43A66 ComfortTec Quilted Heated Electric Mattress Pad, King Cotton America's #1 Electric Heated Blanket! Turn down your thermostat and still relax in warmth and comfort quilted construction top 35% cotton / 65% polyester, 9oz/yd of fill, bottom 100% polyester skirt fits up to 21 mattresses ComfortTech Controller 10 Heat Settings, 10 hour auto-off, LED display, adjustable dimmer