Runs narrow
I got the adult regular for my Mom. She is size 9. They are tight/narrow.
The size chart says fits size 5-11. I didn’t want to size up because these socks are for men, too, so I bought according to the size chart.
They are soft and the sheep design is so cute. But, they are difficult to put on because they are a narrow fit. Given all the soft cuddlieness, a wider sock would feel more comfortable.