KIMOTHY C My friend who I bought this jacket for is 5'11, 156 lbs, and the Medium fit him great. He is very slim as well. He is always trying to increase his weight. You are almost 20 lbs more than him. I don't know the answer... but I would try the medium.

etienne b pretty much every known outdoor company make their gear in Asia now a day...even arcteryx that used to make their gear in canada now has ASIA made gear and their price are still retarded...oh well sry i had to.