This is a really nice jacket for alpine pursuits. Light weight, but yet still warm. Seems to work fine while you are on the move. Close fitting, so if you're kicking steps, you can see your feet with no problem, and even though it's close fitting, you still have plenty of freedom of movement. Seems true to size. I'm 5'8" and 136 lbs and a small works fine. I tried a medium, but the sleeves were a bit too long and the front wanted to stick out a little in the stomach area, so I kept the small which eliminated the problem. Can be worn with a helmet as well. And of course, whats not to like about Monkey Fur? Bought the Monkey Man gloves to match!