I bought these socks for 4-6 years and now for 5-7 years. Both fit my 3 year old foot. In my opinion, 5-7 suits him better. The 4-6 really needs to stretch a bit, making it harder for him to get back on his feet. However, 5-7 fit without slip. And what we will buy next year. It kills socks and they are sturdy and don't seem to get dirty like other brands we've bought and I can't even count how many we've been through. I would recommend them and buy them again.
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