AllerZip Waterproof Bed Bug Proof Zippered Bedding Encasement, Full DEEP Size (Fits 12 - 18 in. H) Cotton Waterproof: Polyurethane film backing repels liquids like urine & sweat on all six sides Breathable Barrier Fabric: Guaranteed NOT hot to sleep on. Allows body vapor to breathe through pad. 3-sided zipper lock is certified barrier for bed bugs, dust mite & allergen. Easy to Wash & Use: Machine washable in warm or hot water. Tumble dry on medium heat.