Protect-A-Bed Luxury Waterproof Mattress Protector, King Thermo-regulating fibers make this the coolest waterproof protector to sleep on Waterproof: Polyurethane film backing repels liquids like urine and sweat Breathable Barrier Fabric: Guaranteed NOT hot to sleep on. Allows body vapor to breathe Fits King size mattresses. Dimensions: 76 x 80 x 18 in.