6'0 / 177lbs / 41" chest / 34" waist - Size Large fits perfect with the right amount of room for another layer under if needed. Jacket has some stretch which is great for a rain jacket. I will also wear this as a wind breaker on those days where the wind might bring some moisture. Very comfortable. I could size down to Medium if I wanted it to be aero but I have found with rain jackets that if they are too tight there is no air movement and they get a bit humid inside. Less than 24 hours after receiving the Torrent I got caught in a torrent! I saw the clouds coming and threw on my new Torrent Rain Jacket as the first drops fell. 5 minutes later I was riding head on into the downpour. 20 minutes later I was home and the only part of me that wasn't soaked was my body and arms, bone dry!