Waterproof, Stain-Resistant Terry Cotton Protective Mattress Encasement Defends Against Bed Bugs, Dust Mites, Allergens- 10 Year Warranty cotton 10 year Manufacturer Warranty included Completely encases mattress for added protection Four-sided zipper system allows one person to easily cover, remove, and clean. Internal protective flap and Velcro closure cover the zipper for protection. Fits mattresses 8"-14" in height.