1. Easy to put on and take off: No retaining ring, soft and comfortable material makes this waterproof arm cast cover easy to put on and take off in a painless way, keeping blood circulation. Adult Size: 12" to 20" upper arm circumference" (30.5cm to 51cm) 2. Soft and comfortable waterproof sealing: The waterproof sealing material is neoprene composite elastic fabric, which has better elasticity, and the softer it is, the less pressure at the seal, the softer and more comfortable it is. 3. and Stretchable: The seal ring is made of medical grade silicone material, which is stretchable and easily fits most sizes of male and female arms. Can be used in the shower, bath or outdoors while recovering from injury, surgery, accident or suffering from medical conditions such as cuts, rashes, burns, skin problems, wounds and scratches. 4. COMFORTABLE AND EASY TO USE: No bulky plastic septum, minimal restriction on blood flow. Self-sealing, highly elastic cutouts make this waterproof cast shower cover easy and painless to pull up and down. Fits slender and thick arms without worrying about cover tearing. 5. Smart Improvements Compared to Older Versions: Compared to other arm protectors on the market, our broken arm shower bag won't aggravate injuries when put on or taken off. It is very convenient to use without any bulky seals. The loop will not be cut off. No additional tape or fasteners required.