Michael E.wrote a review of Five Ten Moccasym Climbing Shoe - 2012 Model on May 9, 2012
Really comfortable shoe to wear, not great on overhangs but smears really well. I was wearing a (very tight!!!) men's 9, 5.10 team shoe-the blue ones-and wear these in a 7. Yeah! I know! Could barely get these on to try out. But they immediately stretch out so well that it molds to the shape of your foot.
Evolv defy's I wore an 8
5.10 team 9/9.5
Mocs I wear a 7
Hope that helps for your fitting them.
Thanks backcountry for being so helpful too!