Natural Comfort Anti-Bedbug Waterproof Box Spring/Mattress Encasement, 14-Inch, Twin Fabric consists of 180T microfiber and 0.025 white TPU (Thermoplastic urethane) Anti-allergy and prevents bedbugs, dust mites and bacteria Waterproof and anti-fluid features protect mattress from liquids 14-Inch deep pocket lets it cover the mattress or the box spring completely