SafeRest Premium Zippered Mattress Encasement - Lab Tested Bed Bug Proof, Dust Mite and Waterproof - Breathable, Noiseless and Vinyl Free (Fits 6-9 in. H) - Twin Size Independently lab tested and certified bed bug entry, escape and bite proof (Twin Size 39" x 75" x 9") Surrounds and protects the 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 (great for those with asthma and allergies)