The concept of ultra light is truly put to the test with this jacket. It feels like it might float away. Designed for the extremely weight conscious adventure athletes the jacket weighs a mere 121 grams and fits in your hand, yet is made out of Araneum, a proprietary 20 denier nylon fabric that is windproof, water resistant, and durable. The jacket features all of the latest in utilitarian design that we have grown accustomed to in any well-made jacket: helmet compatible hood, chest pocket, and elastic cuffs and cords for micro adjustments. This jacket is non- coated meaning that as top out on the peak, the heat your body generates will dry out the jacket. Just don't forget to hold on to it, the wind will whisk this jacket away!