I am an RN and work 12 hr shifts mostly on my feet the whole time. I really loves these even more than my first pair of shape ups!
Not sure why they are more comfortable!  I like the adjustable strap across the foot since I can tighten it or loosen it as the day goes on. I thought when I first tried them around the house that the strap was going to be pushing down on the top of my foot and almost sent them back!  But.....decided to give them one more try and wear them while I was at a party before work.  I  forgot I even had them on and ended  up wearing them to work that night. So glad I kept them.