The prAna Pure Ascent Long-Sleeve Top proves a relaxed fit doesn't have to mean relaxed performance. A micro-ribbed recycled polyester and spandex blend wicks moisture and moves through 4-way stretch, so a hard run or a sweaty studio class doesn't leave us stuck in a clingy top. Side vents add extra breathability and range of motion right where a workout puts the most strain. The result still looks and feels more elevated than a plain performance tee, easy to wear straight through errands after a workout without changing. What Our Gearhead(R) Experts Are Saying:"I ran five miles in this on a warm morning and never had to peel it off my skin the way I do with a lot of tight-fit tech tees. The side vents actually made a difference on the last mile when I was working hardest."