The North Face Furnace 20 Sleeping Bag

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A lightweight, roomy design for 3-season backpacking, The North Face Furnace 20 sleeping bag is insulated with water-resistant ProDown, which repels water and dries faster than traditional down.


  • 600-fill ProDown™ has a hydrophobic treatment that prevents outside moisture and humidity from compromising its loft
  • Comfort-oriented shape has a less-tapered cut than some backpacking sleeping bags, allowing you more room to move around
  • Anti-compression layer composed of Heatseeker™ Eco synthetic insulation is placed along the bottom panel to eliminate cold spots
  • Vaulted footbox allows natural foot movement while also eliminating excess lateral space for improved warmth and comfort
  • Fitted hood improves warmth and comfort
  • Draft collar adds comfort and prevents warm air from escaping
  • Product certified to the Responsible Down Standard (RDS) by Control Union


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 The North Face Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

14 degrees (F) - EN

Tested Comfort

26 degrees (F) - EN

Temperature Rating (F)


Temperature Rating (C)




Zipper Location


Insulation Type


Water-Resistant Down



600-fill ProDown

Fill Weight




Sleeping Bag Shape


Stuff Sack Size

9 x 16 inches

Stuff Sack Volume


Compressed Volume





Down certified to the Responsible Down Standard (RDS)

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