This mattress pad automatically inflates to improve your circulation, soothe sore muscles, and reduce swelling while you sleep. Similar to compression techniques used by physicians, the mattress pad inflates and deflates every three minutes to help blood vessels expand and contract, stimulating blood flow in your back, posterior, and legs, promoting a better night's sleep. Made from medical-grade vinyl, the mattress contours to your body and movements to relieve pressure points. The tethered remote allows you to quickly select your preferred level of firmness, and the mattress remains whisper quiet when inflating or deflating. About the same surface area as a twin-size bed, the mattress pad has two flaps that tuck underneath any size mattress to keep it in place. Supports up to 300 lbs. 78" L x 34" W x 2 1/2" H. (3 lbs.)