Heated fitted mattress pad for a Twin Extra Long size mattress 38 inches by 80 inches. Fits up to a 11 inch mattress also available in deep pocket (15 in. thick) or extra deep pocket (18 in. thick). Easy to use heat control has ten heat settings for exact control. 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.