SafeRest King Size Classic Plus Hypoallergenic 100% Waterproof Pillow Encasement - Vinyl, PVC, and Phthalate Free - Includes Set of Two Ultra-Thin Knitted Polyester provides a smooth surface that stretches and contours with the body Membrane Back Coating Protects Against Dust Mites, Fluids, Urine, Perspiration, Allergens And Bacteria (3-Year Warranty) Great For Those Who Suffer From Allergies, Asthma, Eczema or Bed Bugs Will Not Change The Feel of Your Pillow (Registered With The FDA As A Class 1 Medical Device) Zippered Design Fully Encases Pillow - King Size: 21" x 37" - Includes Set of Two