Features Silver shell technology which helps provide a healthier sleeping environment and extend the life of your bed * Fits mattresses 12" to 18" thick * 100-Percent Waterproof advanced cotton-toweling fabric provides the ultimate protection against stains * Complete surround mattress encasement to protect from stains, moisture, bed bugs and dust mites and highly breathable fabric * Inhibits 99.97-Percent of stain and odor-causing bacteria, mold and mildew, even after 60 washes