I was really excited about these shoes because when I tried them on initially, they were very comfortable, and stayed on my heel.  I have narrow feet, and it's really hard to find flats that stay on my foot.  Usually, if they stay on my foot at the heel, my toes are smashed at the front.  So for just wearing them to work and walking to and from the car, and to and from the bathroom at work, they were great.  However, I went outside to walk around at lunch for a half hour, and by the end of my walk, I had blisters on both ankles such that I couldn't walk anymore, and had to take them off of my ankle and limp back to my office to get bandaids for my ankles.  So the fact that they stay on my heel is nice, but I guess the snug fit on the heel is not good for walking too much :(.