KEEP WATER AND MOISTURE OUT - Our diaphragm seal of cast sleeve is made of high-quality medical-grade silicone. Tight elastic rubber and not easy to tear material is what keeps cast and bandage dry while bathing, shower SUITABLE FOR MOST CAST OR ARM SIZE - The cast cover fits most adult arm, both for men and women. Length up to 23 inches, circumference from 2 to 6 inches. Waterproof cast cover arm adult also can cover finger, wrist, and hand SAFETY AND EASY TO USE - Elastic rubber flange will not cut off blood circulation. No need for tape or straps. Cast bag for shower is easy to pull on / pull off on arm cast without worrying about cover tear up GUARANTEE - Don't worry about the cast protector ever leaking, breaking or being damaged. We provide a lifetime warranty. We will replace plaster cast waterproof cover arm or give your money back if the waterproof arm cast protector is broken