Full XL Size 54 in. x 80 in. Heated Mattress Pad. Easy to use heat control has ten heat settings for exact control. Dual heat controls to regulate each half of the bed included. Quick warm up. Quiet operation. Automatic shut off after ten hours. Radiant from below relaxes tired back and legs, includes deep, restful sleep all night. Awake revitalized. Pre-warm bed. Drives out dampness. The mattress pad that the heater is built into is not water proof. The heated mattress pad is made of two sheets of fine weave, pre-shrunk poly cotton cloth, quilted together with bonded polyester fill in between.