What do spring hikers, summer trail runners, and deep winter backcountry skiers have in common? They all want the lightest, most effective base layers they can get their hands on, or their arms in. The Next to None layers fit like a second skin, stretch superbly, protect you from the sun with a UPF 30 rating, breathe and move moisture with AirVent™ technology, and fight off smells with ActiveFresh™ odor control. For something that's named Next to None, these layers sure do a whole lot.