Bed Bug Blocker All-In-One Pillow Protector Cover Protects Against Bugs, Dust Mites, and Allergens (2 Pack), King 50% Polyprolylene/50% Polyethylene; 100% Polyethylene Lining Imported Pillow protector blocks bed bugs, dust mites, and allergens with complete encasement Technologically advanced, ultrasonic seal technology for best barrier protection Waterproof pillow protector is stain resistant and extremely durable Hypoallergenic for those individuals that may be sensitive, doctor recommended Made of quality polypropylene and polyethylene for ultimate protection