I typically wear a 7.5 if the toe box is wider.  As this shoe is not, and having read other reviews, I ordered both a 7.5 and 8.  Unfortunately, they both have to go back.  The toe box is very narrow and comes to a point so the 7.5 pinched terribly and I walked out of the 8 because it's longer than I need in the heel.  Shame because the support and comfort this shoe provides appear to be outstanding, and it is a light weight shoe.