TEMPERATURE RATING: ISO Comfort Rating: 32deg F / 0deg C ISO Limit Rating: 22deg F / -6deg C MATERIALS: Insulation: Cirroloft Shell material: 380T Nylon Taffeta Liner material: 50D 300T Poly Taffeta DESIGN & DETAILS: The Kelty(R) Pack Cosmic Synthetic 20 is designed with CirroLoft synthetic insulation Internal stash pocket stores smaller items so that you'll have easy access when needed PFC-free DWR fabrics and natural footbox for more wiggle room Includes compression stuff sack