The size is M, listed as 23.5cm, but this is approximate. I usually wear 23.5cm shoes, and these fit perfectly (with a little extra room in the toes). I'm selling them because I stopped using them after wearing them 2 or 3 times. There is some dirt on the heel of one shoe, but it won't touch your foot when you wear them, so please don't worry. Please refrain from purchasing if you are concerned. ◎Regarding packaging I will ship via Takkyubin Compact, thank you.