Considering some reviews, I was concerned about the quality of these socks.
My son wears his clothes hard. He's 4.5 and active and busy. His feet are just shy of 7" long and he's wearing a size 11.5ish shoe usually. We got the size 6-8years in these and they fit wonderfully. They are a hair too big, but not so big they're sliding on his feet at all. They stay put on his feet and calves, and in his rainboots. They don't fall/slouch down around his ankles. They are holding up well to regular washing as well. I'm super happy with the style and quality. They're also soft and smooth, which given my guy can be a bit sensory is very important. Plus, the colours are fantastic! My guy loves them, and they're fun to wear mismatched as well! I will definitely be buying these again, as they're an all round win for us.