Bed Bug Dust Mite Allergy Relief Waterproof Zipper Mattress Cover and Protector (King) Protect your mattress with the basic mattress cover protector. Zipper mattress protector defends against bed bugs, body fluids, skin flakes, bacteria and dust mites. 100% Micro Fiber with Polyurethane laminated. Smooth soft and comfortable under the sheets, 14 inch pocket. King : 78" x 80"