Insulated with Polarguard HV.New Wave Baffle construction to increase loft and warmth.Feely Draw cords to ease mid-night draw cord fumbling. Smooth flat cord for upper draw and round cord for lower draw.Snagless draft tube, made of heavy oxford clothes to repel zipper teeth.Locking zipper to prevent bag from opening in the middle of the night.New Stash pocket for night time essentials.Two hang loops for airing out the bag.Stuff sack and Storage sack included.Mateable- Order Left or Right zipper.