Safe & Reusable: This upper arm shower cover is made of waterproof TPU material for effective moisture protection. The inner sleeve features a comfortable and breathable fabric that is durable, washable, latex-free, and non-slip. Safe for use: Suitable for individuals recovering from injuries, surgeries, or skin conditions. Usage tips: Insert the lining and place the sleeve on your arm. Bend your arm and lift the edge with your fingers, then press the sleeve to release air. This creates a tight seal that prevents water from entering. Applicable users: Designed for most adults weighing 45-64 kg, with an upper arm circumference of 19-23 cm and lower arm circumference of 16-19 cm. Easy to wear: The high-elastic opening allows for effortless application without pain. The cover will not stick to the arm during use and helps keep plaster casts or wound dressings dry while maintaining normal arm circulation.