I am in the process of returning them.  The left foot seems to be a size bigger than the right foot. When I tried them on, my left foot had to clinch to keep it on, if not it fell off. Right foot fit fine.  My feet are the same size. I was not able to walk in these comfortably, and changing the buckle didn't work either. I wasn't impressed with them. But, it probably helps if I had two in my correct size.  It's not worth trying again, just returning them.