DESC: The Sawtooth has all of the features and bombproof construction that you've come to expect from Marmot. This 15-degree mummy bag uses a 600-fill down to bring you all the warmth and comfort of nature's best insulator. Marmot has added their X-static draft tube to block cold air from sneaking into this highly compactable bag. You won't accidentally unzip your bag, as you toss and turn, with the help of locking two-way zippers. Now you can sleep easy in this updated version of Marmot's award winning sleeping bag.