The encasement features Ultra-Fresh antimicrobial treatment that inhibits the growth of bacteria and fungi responsible for creating unpleasant smells and staining in textile and plastic products. By controlling unwanted microbes, Ultra-Fresh antibacterial and anti-fungal additives help to keep products fresh, clean, and odor free. This mattress encasement features: antimicrobial protection, clean & hygienic sleeping environment, super stretch for added comfort, waterproof, easy fit, technologically advanced fabric for protection from stains & moisture, protects from bed bugs, dust mites, mold, mildew and bacteria, machine washable and tumble dry at low temperatures and breathable. - Twin (fits twin XL): 39" x 80" x 12" - Double (fits double XL): 54" x 80" x 12" - Queen: 60" x 80" x 12" - King: 78" x 80" x 12" All Sizes Fit Deep Pockets