The Building Blocks Retro Trunks by Aqua Blu Australia are a great swim piece for every child. Suitable to be worn on their own or under a pair of our swim shorts, the Trunks feature a drawstring for a comfortable and secure fit. - Drawstring for adjustable fit - Comfortable leg binds - Fabric Outer: 80% Nylon, 20% Elastane - Fabric Inner: 100% Polyester