These are high quality socks featuring Pokemon characters. I bought for my 6 year old son who wears size 2 or 3 shoes. These appear to be "Big Boy" sizes, either 6-8.5 or 9-11. After reading other reviews I decided on 9-11. Although they're a little big for his leg now (he still wears them), they won't be big for too long when he's a little older. I would say a size 9-11 would probably be perfect for a child wearing size 4 or 5 shoes.
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