I really love this jacket. However, there is only one problem.
The armpits are cut too high and they really ride up in there and its uncomfortable. I bought a medium as per the size chart, 39" chest I'm 168lbs 5' 9". I tried on a large and it felt too roomy and was an inch longer on the cuff than I needed. Medium fits really well except for the uncomfortable high cut in the arm pit. I feel like I should maybe get the large instead so this doesn't bother me. In the riding position you don't notice it. It's only when your arms are down. This very high cut in the armpit makes it difficult to get in and out of the jacket esp if you have anything more than a t-shirt on.