I'm 6'2", 180lb, ordered Medium Long and its a perfect fit, might be a bit snug for some around the gut, but arm length is perfect for all. Arms are plenty wide for all builds IMO. Gussets are very nice to have. Body material is heavy t-shirt like material, seems like it would be comfortable to wear up into the 70's. Want to buy more but they are pricey!
Pros: Fits well, very comfortable, relatively breathable
This review was written in the old system and had content requirements that are different than reviews written today.