I also use Kng of the Mountain. IMO the best there is. Wool still insulates even when wet thats what makes it wonderful. But you have to buy good wool. All the Columbia and cheaper woolrich stuff is a wool blend. Not to be mistaken with tight woven King of the Mountain. You will pay for it but it's the best wool you can buy. Like Doc said Cool in the warm weather and warm in the cold weather. Late December last year and it was not real cold but around 13 degrees. I had my smartwool long underwear and my King of the Mountain Jacket. Stayed warm in the stand for hours without 20 layers on so you can't move.