I'm a avid runner and train year round in the northeast. I received my socks and had to head out for a short run to try them out, after 7 miles I thought this socks preform vary well. I felt that it was a little thin and could be a thicker for winter. A few days later I tried them out on a long run. Somewhere during the last part of a 24 mile run both toes formed small holes at the ends. The Smartwool felt great and seemed to fit well, so I think it is just to thin for running 20 plus runs and should be used in warmer tempitures. It was a let down, "in the end".