Protect-A-Bed Premium Waterproof Pillow Protector, Standard Pillow Size (21x27 in.) Waterproof: Polyurethane film backing repels liquids like urine & sweat. Breathable Barrier Fabric: Guaranteed NOT hot to sleep on. Allows body vapor to breathe through pad. Dust Mite & Allergy Barrier: Miracle membrane backing provides a healthy sleep zone for your family. Easy to Wash & Use: Machine washable in warm or hot water. Tumble dry on medium heat. Good Housekeeping Seal of Approval