I'm selling the children's ski socks I bought last year. They were used twice, but my child has outgrown them this year. There is some pilling, but they are still in relatively good condition. 【Size】 Approximately 17cm when laid flat, so I think they fit sizes around 15-18cm. They are stretchy. The length is about 24cm from the heel when laid flat. 【Material】 I'm not sure of the details because there's no tag, but the material is very thick and warm. The colors are navy and black. Thank you for your understanding.