Blue Hill Products, Bed Bug, Dust Mite, Flea Proof, Water Proof, Medium, 24'x36"x4", Pet Bed Insert Protection from Bed Bugs, Dust Mites, and Allergens; guaranteed not hot to sleep on Protection from Fleas and Ticks; Ideal for use with Blue Hill, 18"x24"x4" Pet Bed Cover Barrier to liquids including water, urine, saliva Same Material as used in Bed Bug Proof Encasements Made in the U.S.A; Manufacturer's Direct