My child used these for about two years when they were in junior high school (shoe size 22.5 cm). They are size M, so they were a bit large and easy to slip on. They were stored in a shoe box for about five years, but I am selling them to organize my belongings. They are old, so there is some wear and tear, but I think they can still be used. The inside is fluffy and was useful in the cold season. Please refrain from purchasing if you are concerned about used items. To prevent any problems, please understand that no claims or returns are accepted.