Hunting in North Eastern Alberta last November in very harsh winter conditions. High winds and snow blizzards on two separate days. When it wasn't snowing and blowing the temperature would drop, -23c one morning. Somedays I would be sitting in my blind for several hours a day, other days we would be on the spot and stock covering lots of ground. When walking your feet are never a problem, but while sitting for long periods of time is the real test, for all your outdoor clothing. I would wear a thin pair of moisture wicking socks under my trekking socks, when I would get to my blind and settle in, one of the first things I would do is loosen up my boot laces, to allow for better blood circulation. This isn't the first time that I've experienced extreme cold weather hunting conditions and even though I would be wearing the latest and greatest synthetic stocks sometimes my feet would be a problem. Not on this trip though. And I know it was attributed to the trekking socks. High quality, very comfortable and they seem like they'll last. And above all, there warm! Thanks Herdwear. Oh yeah, we were very successful and our freezers are full.