I normally wear a size 8.5 womens shoe.  This one runs small so order up a half-size. The arch support was not enough for my flat feet so I inserted OTC orthotics which I use in most of my other shoes.  I also have arthritis in both of my big toes.  The joints swell up so I need a roomy toe box.  This shoe runs a bit narrow in the toe box area.  I have narrow feet but need that extra room so my toe joints don't become irritated.  This shoe is unfortunately not going to work for me and my arthritic feet so back it goes.