Best T I own. Last time I bought a poly T was in 2004 and it was a "Patagonia Silkweight Capilene T-Shirt - Men's". The Capilene 1 T-Shirt is lighter than that one (which I still use) and longer. That makes it unlikely to come untucked while climbing or other activities.
I have worn this on 5 winter hikes since I bought this on Jan 19th. The days varied in length from 5, 6, 7, 8, to 9 hrs with max of 19 mi and 3300 elev gain with snowshoes in temps ranging from 0° F to 30° F. A wide variety of strenuous winter conditions. On each hike it served great as a base layer. At the car at the end of each trip this T was dry. I also worn it three days in a row at home to work to test its odor properties. Held up great. I decided to wash it after day 3 cause I thought I should, not because it smelled any worse than on day 1.
It is a bit pricey but I will probably buy a second to take backpacking this summer. I usually like to sleep in a cotton T that I do not wear hiking. This one is so good that I plan on wearing one during the day, rinsing it out, wearing the 2nd to bed and on the next day's hike. Got a 11 night trip planned so we will see how this works.