Sale Ends May 27

Marmot  Helium 15 Sleeping Bag

Sale Ends May 27
$321.69to $374.19Save up to 25%
Color: Arctic Navy/Dark Azure
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Packing a lot of heat into a light package, the Marmot Helium 15 down sleeping bag is built for 3-season backpacking and mountaineering treks. It's great for cold sleepers in much warmer temps, too.


  • Certified 800-fill-power goose down features ExpeDRY for quicker drying
  • Main zipper with antisnag slider and fold-down second zipper provides added ventilation and easy access
  • Anatomically designed footbox with wraparound construction increases warmth
  • Smooth, curved baffles reduce down shifting
  • ISO tested for reliable temperature rating
  • 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

Item #217630
Best Use


Tested Lower Limit

16 degrees (F) - ISO

Tested Comfort

27 degrees (F) - ISO

Temperature Rating (F)

15 degrees (F)

Temperature Rating (C)

-9.44 degrees (C)


Short: 2 lbs. 0.5 oz.

Regular: 2 lbs. 2.7 oz.

Long: 2 lbs. 6 oz.


Nylon ripstop

Zipper Location


Insulation Type


Water-Resistant Down



800-fill-power goose down

Fill Weight

1 lb. 2 oz.


Nylon plain weave

Sleeping Bag Shape


Fits Up To (in.)

Short: 66 inches

Regular: 72 inches

Long: 78 inches

Shoulder Girth (in.)

Short: 58 inches

Regular: 61 inches

Long: 63 inches

Hip Girth (in.)

Short: 54.3 inches

Regular: 55.9 inches

Long: 57.9 inches

Stuff Sack Size

7.1 x 14.2 inches

Stuff Sack Volume

9.2 liters



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