The Charlie Banana Swim Diaper and Training Underwear is ideal for the sea or pool, but also as an aid in transitioning from diapers to underwear. The swim diaper is made with an waterproof outer material and is lined internally with organic cotton for effective absorption in Tencel (eucalyptus fiber), which is healthy, ecological, and fresh. The swim diaper allows the child maximum freedom of movement for both playing on the beach and in the water, and its containment function prevents any leaks or spills (solid or liquid). The diaper is easy to take off and put on, and is very useful in the transition phase from diapers to underwear, to help the child get used to it and avoid any inconvenience. The swim diaper is available in multiple sizes. Choose the one suitable for your child based on weight: S: 4.5 to 6 kg M: 6 to 9 kg L: 9 to 12 kg XL: 13 to 25 kg