Runs Small

These are excellent quality, soft, semi stretchy, nice cushion. I’ve been a smartwool fan for many years. The sizing on these kids socks however is way off. My youngest wears a little kids size 8 shoe so I got the small (9-11.5 on the size chart) and the heel doesn’t stay over his heel, it slides down to his arch the sock is so small (this is fresh out of the packaging, un washed). There is absolutely no way they would fit a little kids size 11.5 foot as the size chart states. My daughter wears a size 13 little kids shoe so I got her the medium (12-2.5 on the size chart) and same thing, the heel will hardly stretch over her heel and stay put. I was trying to avoid a too-big sock situation where the heel goes up their ankle because they are too big, which is why I followed the size chart. I wish I would have sized up.