Vincent Tiernan wrote a review of SmartWool PhD Running Light Micro Sock on November 13, 2013
Familiarity: I've put it through the wringer
Fit: True to size
I wear it day in and day out. The "Light" has the right amount of cushion for me. I found that with anything less than that, the "Ultra Light" socks, I wore out the front of the sock before I could really put them to use. Nothing sucks more than your toes poking through the front of your sock. Maybe sand in your underwear.