Thank you for viewing my handmade reusable swim nappy in under the sea print. We are helping to save one nappy from landfill at a time. Branches of me swim nappies are made from a swimwear liner and waterproof outer which is used in modern cloth nappies - pul - this is the best fabric to keep what happens inside the nappy. Stay inside so as long as there is a tight seal around the thigh, the nappy will not leak any unexpected accidents in the pool they are designed with a wide crutch to make sure there is always a sealed leg, preventing leaks. Fold-over-elastic is used all the way around making the swim nappy flexible to be pulled up and down like undies, but also with snaps to make removing the nappy easier on babies or if soiled.These sizes are multi fits - meaning they will last for 6-12months per size (depending how fast your baby grows) they have 3 snap sizes to grow with your baby. Please note: when choosing sizes: if your baby has chubby thighs, or is closer the maximum weight: its best to order up a size as swim nappies are non-fundable for hygiene reasons. Nb 3-5kg - similar to 0000 aus clothes size. 5-7kg - similar to 000/00. M 7-12kg - similar to 00-18months. L 11-15kg - similar to 16months-3yrs. When ordering - please include childs age and weight (if known). In the orders'comments' to ensure the size is right for you. This swim nappy is handmade by myself, using the aquarius pattern by little comet tails. This item is made of pul and fold over elastic.