There is an elastic string that goes all the way around the top of the slipper so one can tighten for a better fit. My daughter is too young to keep these tied so pulled the elastic completely out so they wouldn't hang in her way. This makes the slippers a bit loose but she isn't a serious dancer so I'm not concerned.
These were the least expensive ones I could find which was important to me since my daughter's feet are growing quickly. I was able to buy multiple pairs in various sizes. Good overall value for the price.