An absolute monster of a jacket, I am absolutely digging it. I am 5'8" 180lbs. and I chose a medium. It is a perfect fit. This actually is my seventh Arc'teryx jacket, and it is now my favorite. I had been wearing a Stingray on the mountain, but the Modon is a huge upgrade. At first I was a bit concerned, it being an insulated jacket, that it may be too warm. This new Coreloft Compact is excellent. I have yet to overheat trekking backcountry with backpack and snowboard in tow. I do not notice the insulation at all when it comes to movement and restriction. It feels no more restrictive or bulky than my Stingray(last years model). I also tried both the Keibo and the Modon, I definately prefer the Modon. I Couldn't be happier, I am looking forward to putting many more days on the jacket this season.