Feature:Performance mummy cut fits close to the body Performance mummy cut fits close to the body improved thermal efficiency; IFLEX®7D outer shell is durable but light, Skin-friendly and soft as cotton in contact; The down is treated with water-repellent treatment which significantly improves comfort; Lofty 800-fill-power gray duck down provides optimal warmth-to-weight ratio and compressibility; Anatomically shaped cover of the partitioned down channel provides superior down control for long-lasting insulation; Different cut sizes of fabric and lining and three-dimensional sidewalls; 4-chamber hood design maintains even loft around head for consistent warmth; 3D anatomically contoured footbox follows natural foot position for maximum warmth and comfort; Down-filled face gasket with cinch comfortably blocks drafts at the hood opening; Oversize, insulated draft collar blocks the escape of warm air from inside the bag; Draft baffle combined with barrier-free zipper system; 60/40 down filling ratio; Double adjustable headband drawstring; Regular and long of the same series can be spliced; Comes with an ultra-light compression bag and a mesh storage bag.