Hygea Natural Standard Bed Bug Mattress Cover - Crib 28"x52"x6" Water-resistant material protects from all leaks and spills (blood stains, urine stains, sweat stains) that may occur. Waterproof material. Machine washable. Non-Woven Fabric. Stretchable mattress encasement. Inter-locking zipper. Machine washable in temperatures below 140 degrees. Never use bleach. Non-Woven cover fabric ensures the highest level of comfort. Locking zipper and had stitched flap ensure security. Weight: 1 lbs.