Pillow Encasement - Waterproof and Bug Proof- by ExceptionalSheets - 10 Year Warranty, Standard 100% Polyester/1mil Polyurethane coating 100-Percent Waterproof And Anti-Allergen Laboratory tested to prevent bacteria, virus, mildew, mold, dust mites and bed bug penetration Lightweight for easy storage and cost efficient washing/drying 100% Polyester/1mil Polyurethane coating