The Slumberjack Ronin 20 Degree Mummy Sleeping Bag allows 'arms out' dexterity without leaving your sleeping bag. Read at night, grab a cold beverage, or organize gear without having to unzip. And the full length dual zipper allows you to open the bag as wide as you want, so you can control ventilation and stay comfortable. It's time to experience a solid night's sleep a rest that will leave you primed for the next day's epic adventure. Layered, offset, quilt construction prevents cold spots. 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.