Slumberjack Latitude 0 Degree Synthetic Sleeping Bag Cold weather, zero degree Fahrenheit mummy-style sleeping bag with synthetic Slumberloft fill Two-layer, off-set construction and differential cut to prevent cold spots Flat or contoured Flip Over Hood; draft tube to prevent heat loss; anti-snag zipper Trapezoidal Foot Box provides more foot space Polyester hex ripstop shell; polyester taffeta liner