Waterproof: Polyurethane film backing repels liquids like urine & sweat;Breathable Barrier Fabric: Guaranteed NOT hot to sleep on; Allows body vapor to breathe;Dust Mite & Allergy Barrier; Also Bed Bug Entry, Escape & Bite Proof!;Easy to Wash & Use: Machine washable in warm or hot water; Tumble dry on medium heat;Smooth polyester on both sides; Fits standard 21x27 in. pillows