Small size fits well for boy 13/1 US Medium size fits boy US 5/6 They stretch so sizing up or down shouldn't be a problem. Over the years I have bought so many socks for my kids that in a month or two they are full of holes. They literally lasted for years! I was even able to pass them on from one child to another and they looked great. Not to mention these are fun socks. Thank you for making them so well and please don't change the quality! I'd rather spend money on something that will last than spend time and money buying lots of pairs of socks. Thanks very much!
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