People don’t always realize that without a cover like the Sleep Calm EasyZip Mattress Encasement by Fashion Bed Group, stains due to sweat, spills, or mold will void most mattress warranties! Protect your mattress with the Sleep Calm Encasement, a 100% waterproof barrier that easily zips on for 360-degree coverage. Treat your mattress right so that it can continue to perform, night after night, and prevent health problems associated with dust mites, mold, and bacteria. Unprotected mattresses actually gain weight over time as they collect mineral deposits from sweat, dander, dust mites, and more. This cover effectively locks out dust mites and bed bugs, too. The cover is expandable to suit deeper mattresses. A "V-Lock" Velcro cover conceals the zipper to create a truly effective barrier against dust mites, bed bugs, and pet dander. High performance, 100% polyester fabric zips off the top for easy laundering - no need to wrestle the entire mattress each time you wash and replace the top portion of the cover!