For a comfortable night?s sleep, choose the Slumberjack Boundary 40 Degree Mummy Sleeping Bag. Wide design and available Long size give you the space you need to stay comfortable all night long. Unique 'flip over' hood can be turned inside-out for the option of a flat or contoured hood. The flat hood is great for warmer nights, and the contoured hood keeps the heat in when you need it.Layered, offset, quilt construction prevents cold spots. Anti-snag zipper construction. Draft collar prevents heat loss from neck and shoulder area. Flip over hood allows user to flip the hood inside out for the option of a flat or contoured hood. Wider design for more comfort. Slumberloft? synthetic insulation. Shell fabric: 190T Polyester. Liner fabric: Polyester taffeta. Stuff sack included.