This is the lightest down jacket in the world and is designed specifically for women, which has only been possible through the unique mix of premium Crystal Down 900+ and the use of 7D Next to Nothing fabric. With a weight of a mere 134 grams (size s) it is ideal for any purpose where you at the same time need to keep both weight and pack size down to a minimum, but still want the comfort and security that a down jacket gives you. Cirrus works both as a stand alone or as part of a layering system with other garments