This is the best piece of insulation I own, and I own a lot. Its extremely comfortable and performs very well in many situations. Whether hiking, climbing, fishing, working outside in mild temps. This is the jacket you want. I am 6' 3" 220lbs and I wear the XXL. This gives me enough room for my radiant hybrid under and my maximus over if its cold and rainy. I cant speak highly enough about this jacket and OR.