Fashion Bed Group Sleep Calm Easy Zip Expandable Mattress Encasement with Stain and Dust Mite Defense, Twin XL Polyester Twin XL sized encasement fits 12" to 17" mattresses or box springs Fully surrounds mattress to help protect from stains, moisture dust mites, bed bugs, and pent dander Made of technologically advanced fabric with patent pending Easy Zip expandable and removable zippered top for easy cleaning 100% waterproof barrier provides hygienic sleeping area and extends performance of your mattress Protected with a 10-year limited product and mattress warranty Twin XL sized 1% waterproof barrier that will extend the performance of your mattress Provides you and your family with a hygienic sleeping area Made of technologically advanced fabric with patent pending Easy Zip expandable and removable zippered top for easy cleaning Revolutionary mattress encasement fully surrounds your mattress to help protect from stains, moisture dust mites, bed bugs, and pent dander Machine washable, fits 12" to 17" mattresses or box springs, and comes with a 1-year limited warranty Prohibits a mattress from increasing in weight due to sweat, dead skin cells, liquid spills, dust mites and mold build up V-Lock Velcro cover over the zipper enclosure provides the ultimate barrier against dust mites, bed bugs and pet dander Easy fit, super-stretch fabric fits most mattresses