I've been in the market for a lightweight, compact jacket for both solo use and pairing with my Carhartt shell. At 6' 3", 170lbs sizing is often troublesome (long arms and skinny torso). The medium fit beautifully. Perfect in the arms and enough room in the torso for layering without being huge.
When I pulled it out of the bag my initial thought was "this thing is way too light to work". I was fortunate enough to be blessed the next day with a usual Central Illinois January day of -17F to try it out on. I went out on a 3 mile walk with just the jacket and a cotton long-sleeve base layer. Despite the 15mph wind and chilly temps, the jacket performed like a dream. I felt no chill come through and while my face was a nice windburned red at the end, everything covered by the jacket was nice and toasty, but not too much to make me sweat.
All I could say when I got home was "WOW". This is a fabulous get and I look forward to putting it through its paces. I am swapping it out though for another color since "Arbor Green" was a little too soft for my super macho lifestyle :) Buy this jacket!!