This is a set of two Moomin socks, a souvenir from Helsinki. When laid flat, the length from toe to heel is about 11cm. EU size is 25-27. It is approximately 15cm-16cm in Japanese size. Please refer to the size difference in the 6th image. Before purchasing, please check if the size is similar to the flat size of your existing socks. The design is not sold in Japanese online shops. Since it was clearly too small for my daughter (shoe size 18cm) who usually wears 15-20cm socks, I am selling it unused.