DESCRIPTION

With an atomic number of just one, hydrogen is the lightest element in the universe. And weighing in at just 2.5 ounces, The North Face Hydrogen Vest is the lightest top in your arsenal. Made of wind-resistant nylon, this vest provides light insulation for your pre-dawn run around the neighborhood or for your ultralight through-hike. The Hydrogen has reflective logos to keep you visible in in the early morning hours, and, once the sun comes up and warms your body, mesh side panels let heat exit before it ruins your workout.