ProtectEase Allergy, Waterproof Mattress & Pillow Protector COMBO PACKBack To College Special (Twin XL) Mattress: Top, Bottom & Sides: 100% Polyester with 100% Polyethylene Film Fully Encasing Mattress Protector With Zippered Pillow Protector Allergen, Dust Mite & Beg Bug Barrier And Is Stain & Spill Resistant Soft, Quiet & Discreet Protection Premium E-Z Zipper Stays Together Allergist recommended