These baselayers are light and breathable, which is awesome when I'm touring in the backcountry. The interior grid structure wicks away moisture while trapping warm air so I stay comfortable all day. -Gearhead(R) Expert JoWe made the Backcountry Pines Microgrid Ultra-Lt Baselayer Bottom for chilly days when we're snowshoeing our favorite winter trails and skinning into the backcountry. The interior of the pants is designed with a microgrid pattern that manages moisture while helping us thermoregulate, and the stretch fabric gives us total freedom of movement on technical adventures. The smooth outer material slips on effortlessly beneath our bibs, and the HeiQ Fresh FFL odor control technology keeps us smelling fresh after a long day in the mountains.