I'm not sure how to gauge the fit.  I wear a size 8 and thought that was what I ordered.  Instead, I received an 8.5.  It does fit but since the material has some stretch in it; the 8 may have fitted even better.  I definitely need to wear socks.  Otherwise, its a very comfortable shoe.  I had no problems performing my workouts in them.  I would suggest that if you don't have a wide foot to order your original size and you would be fine.