From the ?why didn?t I think of that? files, meet the Slumberjack Ronin 0 Degree Sleeping Bag. It?s designed to allow 'arms out' dexterity so you can read, grab a beverage, or organize your gear without having to unzip. The versatile full-length dual zipper allows you to open the bag as wide as you want, so you can control ventilation and stay comfortable.Layered, offset, quilt construction prevents cold spots. Draft collar prevents heat loss from neck and shoulder area. Draft tubes along zippers keep out cold air and prevents heat loss. External Velcro? fastener closure tabs combined with dual zippers create "arms out" functionality. Contoured jacket style hood can be inverted to create a pillow on warm nights. Heavy duty #8 zippers with anti-snag protection. Slumberloft synthetic insulation. Shell Fabric: 190T polyester. Liner fabric: soft touch polyester. Includes compression stuff sack.