Mountain Equipment Helium 800 Sleeping Bag - Women's

$296.93 to $310.93
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Staying in unheated tea houses in the Himalaya or winter rooms in the Alps? The warm, lightweight Mountain Equipment Helium 800 women's down sleeping bag is ideal for trekking in cold, dry conditions.

  • Features

    • Mountain Equipment's Good Night's Sleep rating for this bag is 9°F; this may tally closely to the EN/ISO rating, but for certain bags the discrepancy may be larger
    • The Good Night's Sleep temperature rating is based on laboratory and cold-chamber testing, plus extensive experience manufacturing sleeping bags for use in extreme conditions
    • HELIUM™ 20 outer shell is very light and highly breathable
    • 728g of 90/10 pure duck down has a minimum fill power of 700
    • Alpine fit with zoned EXL® system maximizes thermal efficiency
    • Slanted box-wall baffles throughout reduce weight from the sleeping bag's structure
    • Midlevel side seams afford great versatility whether the bag is laid on its front or back; they also improve even distribution of fill
    • 5-baffle anatomically shaped hood provides high levels of down control, low weight and excellent insulation
    • 4-baffle anatomically shaped and offset footbox restricts down migration while keeping weight and bulk to a minimum
    • Full length Gemini™ zip baffle and integrated collar with Lode Lock™ closure
    • Comes with a waterproof roll-top stuff sack and storage cube
    • Certified to the Down Codex® standard, which promotes transparency and animal welfare in the down supply chain
    • Mountain Equipment is a member of Fair Wear Foundation, a European initiative working to improve workplace conditions in the garment and textile industry


    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.

    Additionally, Mountain Equipment conducts their own laboratory and cold-chamber testing to give their bags a Good Night's Sleep temperature rating–a rating they feel is the most accurate reflection of a bag's potential in real-life situations.
    View all Mountain Equipment Women's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    12 degrees (F) - EN

    Tested Comfort

    25 degrees (F) - EN

    Temperature Rating (F)

    25 degrees (F)

    Temperature Rating (C)

    -4 degrees (C)


    Long - Left Zip: 2 lbs. 13 oz.

    Regular - Left Zip: 2 lbs. 11oz.


    20-denier nylon (38 g/m2)

    Zipper Location

    Long - Left Zip: Left

    Regular - Left Zip: Left

    Insulation Type



    90/10 700-fill-power duck down

    Fill Weight

    Long - Left Zip: 1 lb. 11 oz.

    Regular - Left Zip: 1 lb. 9.9 oz.


    30-denier nylon (49 g/m2)

    Sleeping Bag Shape


    Fits Up To (in.)

    Long - Left Zip: 73 inches

    Regular - Left Zip: 67 inches

    Shoulder Girth (in.)

    60 inches

    Hip Girth (in.)

    52 inches

    Stuff Sack Size

    11 x 9 x 8 inches

    Stuff Sack Volume

    12 liters



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