Seal Tight Cast and Bandage Protector is the best watertight protection available. Easy to apply with the patented application ring, eliminates need for strapping, pumps or velcro closure. Non-latex diaphragm stretches easily over cast or bandage to form watertight seal. Durable polyvinyl bag prevents water penetration. Reusable. With normal care, lasts 6 - 8 weeks of daily usage.