I love this longsleeve but I ordered the wrong size and cannot return it. I am 5'6" tall, 140lbs with an athletic built (wider shoulders). It fit pretty well around the shoulders but was too loose around the midsection.
Here's the description from the Mammut Site:
"Functional shirt for hiking adventures. It is made from a quick drying and breathable material. A Polygiene antimicrobial treatment reduces unpleasant odors. A zipper at the front makes the shirt easier to put on. This functional shirt impresses with its lightweight, comfortable stretch material together with a trendy melange look."