The jacket is lightweight and so warm. It's water/weather resistant. I've been using it to bicycle commute in the winter wind and rain and it's kept me dry and warm (I just wear a dress shirt underneath). I would use a light shell if I was going to use it in heavy rain for a prolonged period of time though. I haven't tried it in snowy conditions yet, but I can tell it would keep me plenty warm under most circumstances, especially if I wore warm base layers.
I'm 5'7", 145-150 lbs and the small fits excellent. The jacket itself looks great.the pockets are comfy and warm and zip up. The waist can cinch if you need a tight fit.
This review was written in the old system and had content requirements that are different than reviews written today.