Not too hot, not too cold. With Alps Mountaineerings Fusion 40F Sleeping Bag, you can easily get the perfect level of warmth thanks to its unique design. Waterproof quilted top layer is packed with RDS-certified, 600-fill-power down insulation to trap body heat, keeping you comfortable on nights where the temperature reaches down to 40F. The top layer also acts like a blanket throw it open if you get too hot or tuck it into the bag if youre too cold. Zipperless design is the height of convenience. A toggle system secures the flap closed and eliminates gaps between the flap and the bag. Bottom layer is filled with synthetic TechLoft Micro insulation, which delivers incredible warmth while remaining unbelievably lightweight. Drawcord-adjustable hood. Made of 20-denier nylon. Includes compression stuff sack. Imported. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Gender: Unisex. Type: Mummy Sleeping Bags.