I am going to exchange for a size 11, but that may be too small. Very happy wit the purchase. It is a design that avoids many expectations of a clothes rail, like a regular rectangular shape, that I wished Id known about before buying. The elastic gives so they don?t stretch out of shape. I feel myself so frustrated i want to throw this mouse out of the window. Third and worst of all, to mount this setup, the mounting holes that accept the mounting bolts face toward the center of the car. When you store them on the pouch they come with, the material from the inside of the pouch sticks to them! If your little one has chunky ankles they could be too tight at the anklestrap. 4 out 5 because we just built it and I have yet to actually try it out. the fit is great, they dont slide off easily and fairly easy to put on.