These are adorable slipper socks. They're thicker than most slippers I've tried and I love how they fit snugly around the ankle and stay on the foot. The size is not entirely clear to me. They are all listed as 8-12 years old so I cannot recommend a size. I can't even find the size on my slipper tag to tell me what size we are. They are quite big and it will take my daughter a few years to grow up. However, thanks to the design, they remain on their feet despite their size. They are very soft and snuggly, if she can wear them for a long time I know she will love them.