Marmot Helium Down Sleeping Bag

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Remarkably light and compact, the 3-season Marmot Helium delivers impressive warmth and comfort in a durable, water-resistant, 800-fill-power goose down sleeping bag.


  • Ultralight Pertex Microlight 20d nylon ripstop with durable water repellent finish is resilient to wear
  • Certified 800-fill goose down with Down Defender treatment for improved water-resistance in wet conditions
  • Fold-down second zipper provides added ventilation and easy bag access
  • Nautilus multi-baffle hood envelopes your head in warmth; adjustable drawcord cinches hood about your face
  • Anatomically designed footbox with wrap-around construction allows down to loft fully around your feet for optimum warmth and comfort
  • Smooth, curved baffles reduce down shifting; stretch tricot baffles provide strength and durability for long bag life
  • Insulated draft tube backs a full-length, 2-way, snag-free zipper to prevent cold air getting in
  • Internal stash pocket stows nighttime essentials
  • Zipper garage keeps zipper pull in its place at night
  • 2 hang loops for storing and airing out sleeping bag
  • Stuff sack and storage sack included


Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Marmot Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

13.5 degrees (F) - EN

Tested Comfort

25.2 degrees (F) - EN

Temperature Rating (F)

15 degrees (F)

Temperature Rating (C)

-9 degrees (C)



Zipper Location


Insulation Type


Water-Resistant Down



800-fill goose down



Sleeping Bag Shape


Stuff Sack Size

7 x 14 inches

Stuff Sack Volume

8.8 liters



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