SafeRest Premium Hypoallergenic Waterproof Certified Bed Bug Proof Crib Mattress Encasement - Vinyl, PVC and Phthalate Free - (52" x 28 x 6 in.) Cotton Independently lab tested and certified bed bug entry, escape and bite proof Surrounds and protects the crib mattress on all 6-sides against allergens, dust mites, bed bugs, bacteria, fluids, perspiration and urine (10-year warranty and machine washable) Exclusive Micro-Zipper technology prevents all stages of bed bugs from passing through the zippers teeth 360 Secure zipper closing feature prevents accidental openings by sealing the end zipper traveler with a Velcro flap Premium cotton terry surface material with breathable hypoallergenic membrane backing keeps the mattress cool and noiseless while blocking dust mites and other allergens.