Marmot Helium 15 Sleeping Bag

$429.00to $499.00
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.

  • Features

    • 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


    Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. 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. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
    View all Marmot Men's Sleeping Bags
  • Technical Specs

    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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