CHECK SIZING IMAGE FOR FIT: Bloccs Child Arm Cover Extra Large (CA79-XL) It's very important to measure around the arm and length of the cast to ensure you have the correct circumference for a watertight seal. FIND YOUR SIZE: Your measurements may match different product sizes. To ensure a good fit and a watertight seal, select a product long enough to cover the cast (extra length is okay) that is comfortably within the arm circumference range. Consider adult and child sizes when measuring. EASY TO USE: The Bloccs Child Arm Cover Extra Large is easy to put on and take off, providing a hassle-free experience. Simply slide the sleeve over the cast to create a watertight seal around the arm. DURABLE AND REUSABLE: Made from high-quality natural rubber, this cast cover for children can withstand multiple uses without losing its effectiveness. VERSATILE: Our cast cover keeps your child’s cast or bandage dry whilst they shower or bathe. It is compatible with both plaster and synthetic casts, and is ideal for children with arm or hand injuries. You can enjoy swimming and other water activities without as much discomfort or worry. It’s perfect for vacations, beach trips and cruises enabling you to have fun and make the most of their recovery time.