TERMINIX Ultimate Mattress Protector - 6-Sided Water-Resistant Zippered Encasement Blocks Bed Bugs, Dust Mites, Insects, & Allergens - Machine Washable - up to 11" - Twin XL TERMINIX&#174; Premium quality 6-sided cover provides maximum protection with lasting durability. Guaranteed to block bed bugs, dust mites, and insects Laboratory certified, Entomologist tested, Lifetime Warranty. Bed bug protection Hypo-allergenic allergen barrier, bedbug blocking, water resistant. Dust mite protection Snug fitting, Easy on, easy off zipper encasement - Fits mattresses up to 17" deep (Twin and Twin XL up to 11" deep) Machine washable and stain-resistant