Warm. Comfortable. Lightweight. Those were the 3 primary driving factors for us when we set out to design the Alaska Down Sleeping Bag. To accomplish this, we utilized the highest quality insulation in 850 Fill Power, Nikwax ® treated Goose Down. This Goose Down is going to give you maximum insulation while being extremely lightweight. For the exterior of the bag, we use a 20D CORDURA® Double-Rip-Stop fabric, that is not only light, but considerably more tear resistant than any other down sleeping bag on the market. With expandable side panels, the sleeping bag can be adjusted between comfort fit or the ergonomic mummy shape. With the panels open, you can sleep on your side comfortably. The footbox is stuffed with extra goose down to keep your feet toasty, and we added a sleeve in the hood to keep your air pillow or rolled up jacket in place. Additionally, we utilized a center zip making it far more comfortable while allowing efficient ventilation. To solve the issue sliding off your sleeping pad, we implemented a stretchable sleeve on the bottom of the bag to house your air mattress. The lining of the bag is constructed of high-visibility orange allowing you to use it as a signal panel in the event of an emergency, and inside the bag you will find two large mesh pockets for nighttime essentials. Temperature Rated for 0F°/-18C° and extreme of -40F°/-40C°