We buy a pair of these socks for our children and they are just as good as SmartWool socks for adults. It is worth noting that the difference between small and medium is noticeable. My daughter wore a small last year, wore size 8 tennis shoes and Crocs with size 10 Vasque hiking boots this winter. She will be wearing size 11 Keen boots this year so we bought her a medium sock. The small one was quite tight, the middle one was a bit loose. It's good either way, but it's something to watch out for.
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