Natural Comfort Anti-Bedbug Waterproof Box Spring/Mattress Encasement, 9-Inch, California King Microfiber 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 9-Inch deep pocket lets it cover the mattress or the box spring completely