Nice shirt, runs big
Very nice fabric, but runs big. I would recommend you go down a size. Not the same with all ex-officio shirts, though. I ordered another one and the medium fit just fine. It doesn't say in the description, but there is a 1 inch stripe of almost see-through fabric running down both outside seams of the chest area. A little too weird for my tastes, but I'm sure it would keep you cool! I am returning it for this reason.