In smart contrast to electric blankets, the Rest Secure Restwarmer mattress pad generates heat underneath your body with zoned heating for customizable comfort. The design fits snugly onto standard depth mattresses up to 12 inches thick with extra cushioning on top to prevent the sleeper from feeling the wires running through the pad. Dual controls let two sleepers tailor the sides of the bed to different tastes, while the zone design creates gentle warmth around the torso and extra heat at the feet. Rest Secure uses a durable 100 percent polyester fabric called Fiber-Woven to protect the mattress and ensure long-lasting use of the pad. Equipped with a 10-hour shut-off mechanism for safety, the piece is even machine-washable and dryable. It carries a full five-year warranty and comes in full, queen, king, and California king sizes.