"What Our Gearhead® Experts Are Saying:""I pulled this on for a cold trail run when I couldn't justify a full balaclava, and it cut the wind at my neck without adding any bulk. By the second lap my effort picked up and it never felt clammy or wet.""Some cold weather gear insists on doing everything, and the Bluet Ubertube isn't interested in that approach. Outdoor Research trimmed this one down to a low profile shell built specifically for the effort of winter trail running, skinning up a skin track, or a cold morning at the crag, adding warmth exactly where it's needed and nowhere else. The polyester spandex blend wicks sweat as effort ramps up, pulling moisture away before it has a chance to chill you on the descent, and quick drying performance means it's ready to go again the next morning without a second thought. It's built for back to back days, the kind where gear needs to dry out fast and disappear on the body once you're moving."