Bambino Mio Swim Diapers Say goodbye to disposable swim diapers and enjoy these lightweight swim diapers fromBambino Mio. Available in a variety of cute prints these swim diapers allow your child to sport a stylish swim diaper at the pool or beach. The outer material is made from an 80% polyester and 20% elastane blend. Inside is a hidden water resistant barrier and soft cotton terry that is up against your little ones skin. Swim diapers are designed to prevent solids from escaping while allowing liquids to flow through. The elastic at the legs and the drawstring at the waist help keep any messes inside. Machine washable. Sizes: Small - 11-16 lbs Medium - 16-21 lbs Large - 21-27 lbs Extra Large - 27-34 lbs Sizing is approximate.