This is advanced six-sided cover that completely encloses your mattress in waterproof, antimicrobial protection for cleaner, more hygienic sleep. Made from a unique, award-winning fabric, it creates a physical barrier against bed bugs and dust mites while antimicrobial silver inhibits bacteria, mold, and mildew to help prevent deterioration, stains, and odors. Unlike five-sided protectors that can leave areas exposed, this protector surrounds your entire mattress with a locking zipper for the most effective protection available. Antimicrobial properties remain active for over 50 machine washings. Fits mattresses up to 18" D. White.