I purchased this at a used clothing store in Harajuku. The size is listed as 9/40, but I'm not sure of the official size. I selected 26.0 cm in the size options, but I chose it approximately. I usually wear 24.5-25.0 cm, and there's space as shown in the 6th photo. However, they are too big for me, and it's difficult to walk in them. There is no box.