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. Using 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 4564 kg, with an upper arm circumference of 1923 cm and lower arm circumference of 1619 cm. Easy to wear: The high-elastic opening allows for comfortable, pain-free application. The cover will not stick to the arm during showering and helps keep plaster casts or wound dressings dry while maintaining normal arm circulation. To use: Place on the liner and cover, bend your arm, lift the edge with your fingers, and press the sleeve to release air. A secure, watertight seal is formed to block water entry.