My son wears a size 5.5 toddler shoe at carter's and these socks fit great. He's 2 and I purchased the 1-3T size. I'm not sure they would fit a 3 year old but they do have some stretch. They're long enough to put over leggings for a cold, windy day and they're pretty warm themselves. The anti-slip grips on the bottom dont seem too rough but there's plenty of it over the length of the sock. I love that it comes in such a big pack because, let's face it, these socks are gonna end up in sock limbo one day or another. Love them, 5 stars.
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