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