I am a size 8.5.  I usually wear size 9 because I have wide feet.  I ordered these in a size 9 and a 9.5.  I'm returning the size 9 and keeping the 9.5, though even the 9.5 is still somewhat narrow and I only was able to wear them for a good hour then had to keep taking them off when I could to let my feet rest from the tightness.  The size 9 was very narrow and tight in the toe area.  I would recommend ordering up a full size, esp if you have a similar foot situation.