PLEASE CHECK THE SIZE GUIDE: Konfidence Splashy swim nappy cover is a garment and in this instance does come up small. They should fit reasonably snug, We strongly measure your child to "Get a great fit!" however if you are in doubt we would recommend ordering the next size up. The Babywarma is fully adjustable to enable a close fit to the body. RECOMMENDED BY SWIMMING TEACHERS: All products come highly recommended by swimming teachers and parents alike. Designed and made by parents for parents. LAY FLAT BABYWARMA DESIGN: Easy to put on and take off, perfect for you little ones swimming classes and holidays. It is easy to clean and keep your child happier and warmer in the water for longer. SLASHY SWIM NAPPY: Eco Friendly and re-useable swim nappy cover made from recycled plastic, which uses a clever combination of stretchy e-Flex material, nylon and soft elasticated Lycra so any little accidents are kept where they should be. BABYWARMA: Keeps your child warm and more comfortable for longer whilst swimming and folds out complete flat making it easy to take on and off whilst also providing extra grip for parents, made of high quality soft 2mm thick neoprene with soft Lycra edging.