We have them in both 1-3t (labeled small) and the recently increased size 4-7 (labeled medium). The small size fits my 2 year old who wears size 9 toddler shoes. Technically they still fit my 5 year old wearing a 12 year old but the top now fits like an ankle sock instead of a crew sock. The medium is perfect for her 12 foot height with little room to grow. Outside of the packaging they are very soft and snuggly. The little ones got a bit rougher and rolled a bit, but even after about two years of wearing, they held up great and didn't get any holes. Additionally, the size of each sock is listed on the arch of the foot, making it much easier to find a pair if you have multiple sizes of the same socks, like we do.
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