The Vibram KSO doesn't do a good job of keeping your feet warm in the cold and wet. I mostly run barefoot on dirt trails, but pull the KSO's out of my pocket when I hit really bad terrain. Cold is the one thing that stops me.<p>I'm moving to the Bay Area myself in a couple of weeks, and was kind of hoping that that was the solution to the cold weather problem. I am a little worried about finding good quality dirt trails.