Features of The North Face Guide 0 Degree Sleeping Bag Cyclone construction wraps the Heatseeker(TM) Guide Insulation around the bag in efficient, compressible vertical baffles Fitted hood for more warmth and comfort Draft collar for comfort and to prevent heat loss Pad loops for attaching the bag to a sleeping pad Vaulted footbox Compression sack and storage sack included 17% more compressible than similar bags Proprietary Heatseeker(TM) Guide Insulation, powered by ThermoliteA(R), is a blend of cut-staple and continuous-filament Insulation that is light and long lasting Fabric Details Shell: 15D nylon ripstop Liner: 20D nylon taffeta Insulation: Heatseeker(TM) Guide