The Marmot Helium Down Long Sleeping Bag is a great choice for backpacking and mountaineering as a three-season bag whose use could be extended into milder winter nights.

This sleeping bag benefits from down insulation yet it packs very small and weighs well under 1100 grams so it will not be a burden on even extended expeditions.

Not only does the outer fabric of the Marmot Helium Down Long Sleeping Bag have a durable water-repellent treatment which cause water to bead up and roll off the surface rather than penetrate the material but even the down insulation also benefits from this treatment.

When the weather is colder, the Nautilus six-baffle hood together with the passive collar system will ensure the warmer air inside the bag stays inside and the colder air stays outside for your comfort.

In warmer weather, the full-length zip will give you ventilation options.

Features

• Certified 850+ fill power goose down
• Marmot Down Defender DWR treatment:
• Stays drier 10 times longer than untreated down
• Maintains 150% more loft than untreated down in damp conditions
• Dries 30% faster than untreated down
• Pertex Microlight shell and lining fabric
• Passive collar seals air inside/outside bag when cinched
• Nautilus 6-baffle hood features six chambers of down around head for better down control and fit and wraps around head to reduce heat loss
• Classic trapezoidal foot box matches shape of feet, wider in toe area and narrower in heel and providing more foot room
• Stretch tricot baffles provide ultimate strength, durability and bag life
• Full-length zipper
• Zipper garage
• Zipper guard prevents lining snagging in zip
• Hood draw cord positioned for easy access
• Down-filled oversized draft tube eliminates cold spots
• Stuff and storage sack included
• Velcro-free face muff keeps drawcord and zipper away from face
• Materials:
• Main material: 20 denier 100% nylon Ripstop DWR 1.2 oz/yd
• Insulation: 850+ fill power goose down
• Lining: 30 denier 100% nylon 1.3 oz/yd
• Filled and finished in Rohnert Park, CA, USA
• Temperatures:*
• Comfort: 27.7°F (-2.4°C)
• Lower limit: 16.3°F (-8.7°C)
• Extreme: -16.6°F (-27.0°C)
• Length: 6 ft 6 inches (198 cm)
• Fill weight: 19.5 oz (553 g)
• Weight: 38 oz (1077 g)

*Comfort is based on a standard woman having a comfortable night’s sleep. Lower limit is based on a standard man at the lowest temperature to have a comfortable night’s sleep. Extreme rating is a survival rating for a standard woman.