The Marmot Helium sleeping bag is from their 850 fill Series. (850 fill US is similar to 700 fill Euorpean). This is a very high quality down only used in the best sleeping bags. Please see the diagram below for the construction techniques used in the 850 fill bags. This 850 fill range of bags use not only the best down but also the best materials and lightweight methods of construction to give fantastic warmth to weight ratios and excellent packability. The Marmot Lithium sleeping bag is the warmest of the 850 fill series and rated down to -18°C. The Lithium is a great lightweight 3 or 4 season bag depending on where you are going. A great bag for year round UK use. Marmot Temperature Limit -18°C Shell Material: LightForce N-120R DWR Features: Certified 850+ Fill Goose Down 793g of down in the reg size. Stuff sack and storage sack included Velcro?-free face muff Hood draw cord Zipper guards Insulated draft tube Classic trapezoidal foot box Full length zipper - Left zip only Down-filled collar Size: Regular Colour: Bonfire Weight: 1232g
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