The Wolf Creek uses a 2-layer construction to help eliminate cold spots and keep you warm. It also has a zipper and chest baffle to keep your body heat inside the bag. It's composed of a polyester outer and liner and comes with a standard stuff sack. When the temps are expected to get close to 0? be sure to bring along the Wolf Creek for a positive experience. Features: - Two layer construction - Outer and Liner Material: 190T polyester - #5 separating zippers - Zipper and chest baffles - Standard stuff sack included Specifications: - Bag Shape: Mummy - Fabric Color: Blue/Black - Dimensions: 33" x 84" - Temperature Rating: 0? - Total Weight: 6 lbs. 3 oz. - Fill Weight: 64 oz.