If I recall, SP jackets run a little big but I did find them true to their sizing charts. I am 6'1", 41"chest, 36" waist and 200lbs and I think I got a Large for the Elite 2.1 and a XL for the Pro 2.1. Now, I wish I got a Large in the Pro. At the time, I was matching up to a 43" in chest looking for a little room.