Waterproof Zippered Mattress Encasement Cover - Bed Bug Proof Protector, Breathable, Twin XL Size, Assure Sleep By L'COZEE Microfiber Thin Quiet waterproof barrier protects the mattress on all 6-sides against allergens, bacteria, dust mites, bedbug, mold, mildew, perspiration, urine, liquids and stains; Vinyl Free material safe for kids, babies and pets. Exclusive TrainZip micro invisible zipper technology offers the ultimate in complete double seal protection to prevent all stages of bed bugs from passing through zipper teeth ( complete instructions included) Secure zipper closure feature prevents accidental openings by sealing the zipper traveler with a Velcro flap . Soft, breathable premium cotton fabric with breathable hypoallergenic membrane backing keeps the mattress cool and noiseless creates a cooler, comfortable sleep surface - no crinkling sound or plastic feel. Lab tested and certified against bed bug entry, escape and bite proof. Twin XL size mattress protector measures 39" X 80"; 10-year warranty. Machine Washable