Sunbeam Slumberrest Luxury Electric Mattress Pad (Full/Double Size) White 100% Cotton Top 9oz Fill cotton 100% Cotton Quilted Top. 300 Thread Count. 9 Ounce Fill. Smart Technology - Thermofine Warming System Senses and Adjusts, to Send Warmth when and where You Need It. 10 Hour Auto-Off Safety and Power Saving Feature.