BLOCK WATER AND MOISTURE: Our Plaster Cover is made of high quality medical grade silicone. The tight elastic rubber and hard-to-tear material is what keeps the cast and bandage dry while bathing. the shower or other water activities REUSABLE AND DURABLE: The child arm plaster protection bag can be reused for approximately 6 to 8 weeks. No smell and latex free. Ideal for home or hospital use when you need to recover from injuries. skin rashes. burns. wounds and scratches FITS MOST CHILDREN'S ARMS: The waterproof arm cast protector fits most children's arms. Length up to 20 inches. circumference ranges from 2 to 5 inches. The large diameter is convenient for free movement. Can also cover the upper arm. the elbow. hand SAFE AND EASY TO USE: The elastic rubber flange will not cut off blood circulation. And the cast protector can easily slide over the toddler's arm. No need for tape or straps. Easy to put on/take off without worrying about the cover tearing NOTE: Fill with water before use to test the water resistance of shower cover. If you have other questions. do not hesitate to contact us. we will answer your question within 24 hours. If you are having leaking issues. breaking and others. do not hesitate to contact us