Mountain Equipment Nova IV Sleeping Bag - Men's

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Built for year-round, worldwide trekking and backpacking, the men's Mountain Equipment Nova IV sleeping bag is a warm, synthetic-fill 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.

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 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. 5 oz.


20-denier nylon

Zipper Location


Insulation Type



Polarloft synthetic fibers


30-denier nylon

Sleeping Bag Shape


Fits Up To (in.)

73 inches

Shoulder Girth (in.)

62 inches

Hip Girth (in.)

54 inches

Stuff Sack Size

12 x 9 x 8 inches

Stuff Sack Volume

14.3 liters



8 reviews with an average rating of 4.0 out of 5 stars

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