I have used this in various conditions in trails on Colorado’s Front Range and road running - typically dry conditions between 20 and 50 degrees. The fit is athletic cut, of which I am big fan; I am 6’ and about 155 lbs and wear a small. The material is stretchy and repels/beads light moisture well; the sleeves are long enough to protect your hands when it’s colder out that anticipated. The synch-cord is a nice touch that keeps drafts out.I have paired it with long and short sleeves and have found moisture builds up the most without a long-sleeve underneath. Also, it dries quickly and allows enough air to pass through that you don’t get clammy but you stay warm. Overall, it is functional as a running piece and I anticipate it working well for mountain biking, but outside of active, cold weather activities this would be a pretty worthless piece of gear.