I bought size 9-11 for my then 8 year old, and they looked large, but after a few washes in warm setting, they shrunk so much, that they barely fit(he wore size 5 shoes). I wish they would have larger size.
 I take the star off, because they are so tight, that he can't put them on himself, but they are the only socks, that are seamless and he drives me crazy with all others.