After ordering about 6 different styles of ski socks that turned out to be too big, I finally found these. The 4XS fits my 2.5 year old's foot (he wears US size 7 shoes). It has a bit of room to grow, but they are stretchy enough that there isn't a lot of extra fabric and they don't bunch up in ski boots. I have already ordered another pair in a different color.
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