We ordered size L for his foot size 2.5 and they fit perfectly. He claims they keep his feet warm. I've ordered several different brands of kids' merino wool socks this season and Icebreaker was his favorite brand for comfort. I also tried on fancy wool socks for him in the same size and the Icebreaker socks felt slightly larger and the Icebreaker band didn't feel as tight as the other brand. The rest of the quality was the same.
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