Protect-A-Bed Luxury Waterproof Mattress Protector, California King natural eucalyptus fiber Imported 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: NOT hot to sleep on. Allows body vapor to breathe. Fits California King size mattresses. Dimensions: 72 x 84 x 18 in.