I ordered this sweater to wear under a wool Ike uniform jacket during a "Winter Wars" Shooting competition. We were outside for 5 1/2 hours in heavy snow and 15 mph winds. Despite the cold, wind, and being soaked to the skin, this sweater kept my core warm! It is comfortable, well-built, and the Large is perfect for my 6', 165 lbs build. The arms are generously long and I could wear the sweater with the sleeves cuffed!