Twin Size 6-Gauge Vinyl Bed Bug Mattress / Box Spring Cover. Waterproof, heavy-duty vinyl for best protection against bed bugs, dust mites, fleas and other pests as well as spills and allergens. Secure 3-sided zippers and welded seams keep bed bugs from entering or escaping your mattress. Laboratory tested and certified bed bug proof. Waterproof to protect against spills, stains and leaks, including water, urine, sweat and blood. Wipes clean without laundering. Fits any standard box spring / mattress up to 9″ deep. Easy slip-on cover can be used as a box spring protector or mattress encasement. Backed by a 5-year warranty.