This is a set of three pairs of kids' socks with non-slip grips. The size is 17-20cm. My child didn't like them, so they were only worn once or twice. I removed the name stickers, and the fabric in those areas is slightly fuzzy. The entire soles of the socks have non-slip grips, so they really don't slip. I washed them again before listing them. Please understand that these are not new items and have been stored at home before purchasing. I will ship them via anonymous delivery.