The Charlie Banana¨ award-winning, stylish, and secure Reusable Swim Diaper is ingeniously made of one waterproof layer and one ultra soft and aborbent TENCEL¨ fabric layer. Lenzing TENCEL¨ is highly absorbent, restricts growth of bacteria, and is the greenest celluloid material currently produced. The wide and soft waist and leg elastics make these Swim Diapers gentle on your child's waist and legs with an adjustable waist tie for extra security, giving your child the independence to pull swim diaper on and off. This product's other uses include underwear, bloomers, and a potty training accessory. Indoor and outdoor use - Day use only. We proudly support the US Swim School association. Reusable Swim Diapers are mandated in many swim schools and public schools as disposable swim diapers are not very efficient at contaning accidents.