Ahhh…nothing will warm you like the Serta 233 TC Dobby Stripe Electric Warming Mattress Pad. The ultimate winter luxury, this electric mattress pad is made of polyester and cotton with an automatic preheat and hold feature that makes your bed super comfy. It features low voltage warming technology and virtually unnoticeable wires for maximum comfort. A 10-hour automatic shut-off and over-temperature protection add safety. Conveniently machine-washable and dryable, this warming mattress pad comes in your choice of size.