I had a bad case of Prima Fasciatis (my arches were burning like fire!), plus heel spurs. Not a good combination when you work retail.
After a foot doctor told me I had high arches, and I could get expensive inserts, and steroid shots for my bone spurs, I did research and found these. Now I can stand all day long with plenty of arch support, and my heel spurs no longer have me putting my full weight on them as a result. Love my Birks!!