Low in weight and warm enough for early Spring and late Autumn use at higher altitudes or Northern latitudes. Specifications HELIUM(TM) 20 outer shell is very light and highly breathable 582g of 90-10 Pure Duck Down with a minimum fill power of 700 Alpine fit maximises thermal efficiency Slanted Box-Wall baffles throughout Mid-level side seams 5 baffle anatomically shaped hood 4 baffle anatomically shaped and offset foot-box Full length Gemini(TM) zip baffle and integrated collar with Lode Lock(TM) closure Supplied with waterproof roll-top stuff-sack and storage cube Weight : 1070g / 37.7oz 100% Polyamide outer/inner, Down fill HELIUM(TM) 20 outer shell is very light and highly breathable Alpine fit maximises thermal efficiency