Purchased size "small", my daughter is a size 7, almost a size 8 in toddler shoes ... they fit her perfectly. I didn't want big socks that would spatter on her legs but these aren't the perfect size, they fit snugly. My daughter loves the variety of colors. The only thing I wish the grips were a little stronger, but we'll see how they hold up over time. I bought these mostly because most of our house is tiled and I want it to be safe in the winter months when the floors are cooler and not slip in traditional socks/slippers. These socks are also great for indoor play areas where kids can wear their own socks!