I think these shoes could be great, but there are a few issues that need to be worked out.  First thing is the size.  The do stretch a little over time, so if you buy them to fit you even a little loose, they are going to keep slipping off the back of the heel. Even a little snug is going to cause them to eventually reach the point where they slip off. If you buy them too small, they are so tight that they smash my toes to the point I can't wear them very long at all, but they willnot slip off my heel when they are this tight.  The placement of the heel pad is a little off too, and it does not sit directly under my heel, but in my smallest/tightest pair as much as halfway up toward the ball of my foot which leads to discomfort with the edge of the suede pad only half covering my heel... very uncomfortable. My larger size is a little bit better, but it's still not centered.  I'm not sure how they intended these work... do they need superstretched out before you can actually wear them?