Kids' size, purchased for a child who is 100cm tall. Men's size M, purchased for a father who is 180cm tall. Flat measurements: Kids: Length 28cm, Waist 19cm Men's: Length 48cm, Waist 37cm The men's size is a foreign size, so it's equivalent to a size L. The tag on the back of the kids' swimsuit has been cut off. Please understand this before purchasing. The men's item was worn only once, and the kids' item was worn about 4 times in the pool. Please understand this before purchasing.