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 by individuals recovering from injuries, surgeries, or skin conditions. Using tips: Insert the liner 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 User: Suitable for most adults weighing 45-64kg, with an upper arm circumference of 19-23cm and lower arm circumference of 16-19cm. Easy to wear: The high-elastic opening allows for easy, 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, insert the liner and cover, bend your arm, lift the edge with your fingers, and press the sleeve to vent air. A secure, watertight seal is formed to block water entry.