I am on my foot at least 10 hours everyday, 2-3 pairs of shoes annually and been with new balance for 10 years or longer, I don't know the engineering behind this shoes but this is the only one model fits my needs, I don't feel any back pain/ my feet doesnt hurt here and there/ some other models are ok to beginning with but gets bad pretty quickly/ so fat it has holds up pretty good ( everyday for 4 month now ) since this is the one then I am getting couple more pairs to let it rotate. My foot and weight are pretty standard, I think.  Any one on their foot for longer hours should give this a try.