I wear a street 10.5. My old style V10s were a size 10 and they were obscenely tight and painful. For my pair of toe-plated V10s I got a 10.5 and that seemed to fit better. Still tight, but much less painful. If I could ever find a pair of the old V10s (in my dreams) I would get a 10.5. I wear 9.5 or smaller in the anasazi velcros, mocs, etc. Hope that helps...