Born and raised in the Pacific Northwest, there are two items I will never have too many of; baselayers and fleece jackets. A good baselayer top is the foundation of an effective layering system ready to meet changeable weather conditions from coastal rains to snowy peaks. Because we take our baselayers so many places, we demand a lot from them. We expect them to be warm but not too hot, durable and yet lightweight, and cozy but not overly bulky.
Over the last five months I got to adventure with the new Arc’teryx Phase AR baselayer, and it is now my top-pick for a synthetic shirt.