Arcteryx does it goood.The soft material size M fit perfect on my 5'9" 155lb frame. The long arms are a plus and no real need for thumb holes. No irritation to the neck when zipped up either.
During a recent single digit cold weather hike I manage to break a good sweat while double-timing. I unzippied to my Phasic AR baselayer and cooled myself, all the while the Acteryx was wicking the moisture away from my skin. This all occured after I had worn the same shirt on six other occasions; three day hikes and three all-day outdoor work sessions. All involved some level of perspiration. Following the day after my double time hike I was threatining to wear the shirt for a seventh time as it had absolutley no odor form any part of the garmet including the conspicious pit area. I could not believe it.
Alas I could not bring myself to wear it without a wash even though I am sure no one would have noticed. Great product.