As a recent graduate in the medical field, working 12 hour shifts would kill my back.
I wore regular tennis shoes and by 3 hours of work my back was killing me. I wore these shoes and was amazed that my back was fine for my entire shift. They are worth the money!
I ordered the narrow because I have some B.O.C. Born & they were wide for my feet. I probly didn't need the narrow, after the end of the day my feel were hurting (as though I was getting blisters), I wasn't sure if it was that I needed a regular width or just that I was breaking the shoes in.
I have already ordered me another pair, though they are not the narrow.