This shoe runs big.  I normally wear a 7.5,so I ordered a 7.5.  When I first tried it on I thought it fit.  So I wore them to work.  Once my feet had warmed up from walking, my foot would slide back and forth inside the shoe.  Not only that, but if I wear them for more than 3 hours my feet are killing me!  No arch support what-so-ever.