The ShowerSafe Waterproof Cast & Bandage Cover is a cast protector made of a durable, reusable and pliable plastic designed to protect casts, wounds, and bandages dry during showering or bathing. Nine different models are available for the Arm, Leg, Elbow/Knee, and Foot/Ankle. SIZES: Arm and leg models come in Small, Medium, and Large. Elbow/Knee model comes in Small and Large. One size fits all for the Foot/Ankle model.