Our White Mountain Textile Dust Mite Covers over exceptional protection at a great value. They are available as mattress, pillows and comforter dust mite covers, in a full range of sizes. They come in two fabric types, 100% natural cotton or stretch knit polyester. Both types of fabric offer excellent protect against dust mites and their allergens. The 100% cotton dust mite covers are breathable and provide cool sleeping surface with an average pore size of 4.39 microns. The stretch knit dust mite covers are smooth and soft with a urethane barrier lining that make them an impenetrable barrier and waterproof. All of the White Mountain Textile dust mite covers feature zipper closures.