The three season Slumberjack Boundary 20 Sleeping Bag is designed for comfort with a wider cut, for a more comfortable nights sleep. It features a unique 'flip over' hood that can be turned inside out for the option of a flat or contoured hood. The flat hood is great for warmer nights, while the contoured hood keeps the heat in when temperatures drop. Layered, offset, quilt construction prevents cold spots. Anti snag zipper construction. Draft tube along zipper keeps cold air out and prevents heat loss. 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. Angled foot box for a more natural foot position for sleeping. Stuff sack included. Slumberloft synthetic insulation. Shell fabric: 190T polyester. Liner fabric: Polyester taffeta.