LUCID Encasement Protector-Completely Surrounds Mattress for Waterproof, Allergen, Bed Bug Proof Protection-15 Year U.S. Warranty Size, Twin Encases the mattress for complete protection from bed bugs, allergens, liquids and stains Deep pocket design accommodates mattresses 6 to 18 inches deep - bottom elastic creates a smooth, secure fit Thin, hypoallergenic fabric is quiet, smooth and breathable and will not change the feel of your mattress 100 percent waterproof with watertight zipper and sealing bug flap