Usage Tips:1.Easy to Put on and Off: No retaining ring, soft and snug material makes this waterproof arm cast covers easily pull on and off in a non-painful way, keep blood circulation.Adult Size: for upper arm circumference between12" to 20" (30.5cm to 51cm)2.Soft and Comfortable Watertight Seal: The material of watertight seal is neoprene composite elastic fabric,the elasticity is better, the softer, the pressure at the seal is small, which make it more soft and comfortable.3.High-quality & Stretchable: The seal circle is made with medical-grade silicone materials and stretches easy to accommodate most size arm for men and women. Can be used for showering, bathing or outdoor activities when recovering from injuries, surgeries, accidents,or when suffering from medical conditions such as cuts, rashes, burns, skin problems, wounds & scratches.4.Comfortable & Easy to Use: No bulky plastic diaphragm, minimal restriction of blood flow. Self-sealing, high elasticity opening hole makes this waterproof cast shower cover easy to pull on and off in a non-painful way. Good for slim and thick arm without worrying about cover tear up.5.Smart Improvement Comparing Old Version: Compare to other arm cover protectors in the market, our broken arm shower bag won& 39;t aggravate the injury while being put on or taken off. It is very convenient to use and doesn`t have any bulky seals. Will not cut off circulation. No additional tapes or fasteners required.