My daughter is 9 and wears a size 10 and they are perfect for her size. They are thick and perfect for winter. They didn't snag or tear and after washing they didn't have little lint left. Good bye!
Pros
We love these tights, they come in a variety of colors. We replace them frequently.
Cons
We bought size M and it still runs small. I suggest girls over 7 buy a bigger one.