Dust mites are in nearly all homes, accounting for up to 20% of the weight of a 2-year old pillow or mattress. Protect yourself and your family against allergens, bed bugs, and dust mites with our Sleep Safe ZipCover Vinyl Box Spring and Mattress Encasement. These premium vinyl encasements are constructed with a reinforced, sewn in zipper that is fully sealed and encapsulated for a no tear construction. With added side variance, these encasements ensure an easier fit on large oversized mattresses and box springs. For added protection, these encasements are anti-bacterial treated on both sides with Ultra Fresh DM-50 to retard mildew, mold, rot, and fungi.