my son is currently in a tight 10 so he's ready for the next size.  his foot is a little wide but not out of the ordinary wide.  to be on the safe side though, i purchased these in a 10.5 W and there is no way they are made for a regular kid's foot; very narrow.  after much struggle and determination i got them on...really cute, but i can't go through this struggle every day.  beware, they are narrow and run a little small.  returning today.