Design and Details The Big Agnes System bags offer technical, roomy sleeping spaces for those who aren't willing to sacrifice comfort or compressibility Modular component system combines a rectangle shaped bag with a Sidewinder silhouette for increased thermal efficiency 3N1 System offers multiple sleeping options for temperature versatility Pad Cinch System fits any pad size with an adjustable drawstring, easily connecting bag to pad Pad Cinch System includes middle secure point for maximized stability, creating a self equalizing system Pillow Barn attached to pad sleeve Low-profile cordlock lets you un-cinch the outer bag with one hand Use the top corner hand pockets to wrap the outer bag around your shoulders like you do your comforter at home Rectangle shaped bag Jacket style hood on inner bag snugly fits the shape of your head Insulated tube along upper hood opening of inner bag seals out drafts All zippers are 2 way zippers, allowing access from top or bottom of bag Anti-snag zipper for a smooth, quick zip and includes internal draft flaps to prevent cold air from entering bag Inner Bag has #3 3/4 zipper with built in draft tube to keep cold air out Outer bag is left zip, YKK #5 zipper Zipper Garages No-draft collar, no-draft zipper Interior fabric loops for sleeping bag liners When inner and outer bags are used together, offset quilt lines boost warmth and eliminate draft areas Regular and Long sized bags available Storage sack and stuff sack included Shell: Ultralight nylon rip-stop Lining: Ultralight nylon rip-stop fabric Pad sleeve: Ultralight nylon rip-stop 850 fill DownTek repels water while maintaining insulating value - bluesign Certified PFC free water repellent chemistry Quilted construction Insotect Flow vertical baffles contour to your body to provide a more comfortable fit and keep you warmer