Mountain Equipment Nova IV Sleeping Bag - Women's

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Ideal for year-round, worldwide trekking and backpacking, the women's Mountain Equipment Nova IV sleeping bag is a warm synthetic bag with a comfortable fit and an innovative construction.


  • Polarloft® synthetic insulation helps maintain warmth even while wet
  • The Mountain Equipment 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-denier outer shell is light and highly breathable
  • Keystone shingle construction offers the greatest warmth for the minimum weight
  • Offset layer construction underneath
  • Mountain fit is both spacious and thermally efficient
  • Anatomically shaped hood and footbox
  • Integrated collar with Lode Lock™ 1-handed quick-release closure uses magnets to draw locking mechanism together, so that once connected it cannot be accidentally opened
  • Full-length zip baffle
  • Includes a lightweight compression sack
  • Closeout


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.

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 Mountain Equipment Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

9 degrees (F) - EN

Tested Comfort

21 degrees (F) - EN

Temperature Rating (F)

9 degrees (F)

Temperature Rating (C)

-13 degrees (C)


4 lbs. 1 oz.


20-denier nylon

Zipper Location


Insulation Type



Polarloft synthetic fibers


30-denier nylon

Sleeping Bag Shape


Fits Up To (in.)

67 inches

Shoulder Girth (in.)

62 inches

Hip Girth (in.)

54 inches

Stuff Sack Size

12 x 9 x 8 x 12 inches

Stuff Sack Volume

14.3 liters



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