Bed Protector Twin XL 9" Complete box spring encasement An impenetrable,breathable,comfortable,smooth material that helps to safeguard your mattress Prevents Bed Bugs, Dust Mites, Mold & Bacteria from breeding in your mattress Zippered on 3600 technology to provide six-sided protection for your mattress and/or box spring Easy to Wash & Use:Machine washable in hot water,Tumble dry low,zip back up immediately after drying