AllerEase Bed Bug Allergy Protection Zippered Mattress Protector 100% Polyester Knit Allergist recommended Protects against bed bug infestations in your mattress Creates a layer that protects you from the allergens that collect in your bedding, while preventing new dirt and allergens from entering Waterproof protection prevents spills and stains from ruining your mattress Backed by the Good Housekeeping Seal of Approval