BLOCK WATER AND MOISTURE: Our plaster cover is made of high-quality medical-grade silicone. The tight elastic rubber and durable, hard-to-tear material help keep casts and bandages dry during bathing, showering, or other water activities. REUSABLE AND DURABLE: This child arm plaster protection bag can be reused for approximately 6 to 8 weeks. It is odorless and latex-free, making it ideal for home or hospital use during recovery from injuries, skin rashes, burns, wounds, and scratches. FITS MOST CHILDREN'S ARMS: The waterproof arm cast protector fits most children's arms with a length up to 20 inches and a circumference ranging from 2 to 5 inches. The larger diameter allows for free movement and can cover the upper arm, elbow, and hand. SAFE AND EASY TO USE: The elastic rubber flange is designed to not restrict blood circulation. The cast protector easily slides over a toddler's arm without the need for tape or straps. Simple to put on and take off without worrying about tearing. NOTE: Fill with water before first use to test water resistance. If you have any questions or experience leakage, breakage, or other issues, please contact us—we respond within 24 hours.