My girls are almost 9 years old, and wear a size 2, so I chose the 7-9 year old size, which was great, (and I would give 5 stars for the size) and there is even room to grow. However, I bought these for karate, because the floor is gross and one kid caught a plantar wart, I wanted non slip protection for them since they can't wear shoes. The sticky part of the socks is mostly in the arch area, not under the heel or balls of their feet, which did no good and was slippery.