Huge vent zips
The best thing about this jacket is the arm vents with full side zips. I love this feature. It is awesome when it is incredibly wet, but little muggy, or if you are just burning up. I am a true medium at 5'10" 160. I used this jacket in a size medium and it was a pretty ideal fit. The arms were a little longer and had a bit of room in the arm pits with some extra material, but I can really overlook that with a jacket I am using for rain protection. If I were to use this as a technical shell for ice climbing and or mountaineering, I might want something a little more form fitting and less baggy to reduce the risk of it getting caught on ropes, slings and ice tools. Other than that this is an incredible jacket and I don't think it will disappoint if using it for rain gear.