I bought these for my two boys aged 3 (shoe size 10) and 5 (shoe size 12) to wear with winter boots. They fit both boys with room to grow but not so much that they are too big. My 3 year old can see they are a little big for him because they slide down but to be honest I didn't expect them to fit him at all. They seem quite warm and they are happy to have warm socks that are "like daddy's".
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