This is my third pair. I wear them all day 5 days a week. There is one major downside that worries me. Maybe this third pair I just received will be improved. The problem lies in the assembly of the back of the shoe, the rack, the heel tab or some other word. If you use a shoehorn or your toe or whatever to put it on your heel it will last a very long time. BUT - if you try to put your foot in and accidentally push down on the tongue of the heel or the back of the shoe, then it's over. It loses