Aller-Ease Bed Bug Proof, Waterproof, Allergy Protection Mattress Encasement, King Fabric prevents bed bugs from biting through specially designed zipper prevents bed bugs from entering Allergen barrier to block out household allergens like dust mites, pet dander and pollen Fits king mattresses 78-inch by 80-inch by 15-inch 100-percent polyester with 100-percent polyurethane laminate Machine wash cold, tumble dry no heat