Set of 6 pairs Sizes vary, but they stretch, so I don't think there will be any particular problems. My son is currently 18cm, and he can wear them without any issues. However, since the number of socks has increased, I'm selling the ones he's not in the mood for anymore ⭐︎ Some have name stamps on them. I've removed as much pilling as possible. They get dirty at nursery school, lol. So, if you don't mind, please consider purchasing them ^_^