Sale Ends May 27

Therm-a-Rest  Polar Ranger -20 Sleeping Bag

Sale Ends May 27
$552.89to $587.89Save up to 30%
Color: Orange
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Built for extended use in the Arctic cold, the light and feature-rich Therm-a-Rest Polar Ranger -20 sleeping bag was designed in conjunction with renowned polar explorer Eric Larsen.


  • Ultralight shell and soft liner are made from 100% recycled nylon; shell and liner are certified to the Global Recycled Standard
  • Box-baffled construction is filled with highly compressible, PFC-free 800-fill-power Nikwax Hydrophobic Down™ that maintains loft
  • Nikwax Hydrophobic Down absorbs 90% less water and dries 3 times faster than untreated down—a big plus on long trips where periodic drying is required
  • Down is certified to the Responsible Down Standard
  • Drafts are kept at bay by extensive, overstuffed draft tubes that overlap to prevent cold spots when closed
  • Unique snorkel hood helps seal in warmth while routing exhaled moisture away from the bag to preserve loft; magnetic closure keeps cross drafts at bay and eases entry/exit
  • Cinchable draft collar helps keep heat in
  • A pair of side vents provide customizable temperature control—and free your arms while still in the bag
  • Antisnag YKK zipper ensures easy entries and exits and helps prevent tears
  • Insulated Toe-asis™ foot-warming pocket helps keeps feet toasty
  • SynergyLink™ connectors secure your bag to your sleeping pad to optimize the comfort and thermal efficiency of your entire sleep system
  • Interior stash pocket lets you keep essentials close to hand
  • External loops let you attach a quilt or blanket (not included) for more warmth
  • Compression and storage sack included


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 Therm-a-Rest Backpacking Sleeping Bags

Technical Specs

Item #203088
Best Use


Tested Lower Limit

-20 degrees (F) - EN

Tested Comfort

-4 degrees (F) - EN

Temperature Rating (F)

-20 degrees (F)

Temperature Rating (C)

-30 degrees (C)


Regular: 3 lbs. 4 oz.

Long: 3 lbs. 7 oz.


Recycled nylon

Zipper Location


Insulation Type


Water-Resistant Down



800-fill-power Nikwax Hydrophobic Down



Sleeping Bag Shape


Fits Up To (in.)

Regular: 72 inches

Long: 78 inches

Shoulder Girth (in.)

Regular: 64 inches

Long: 68 inches

Hip Girth (in.)

Regular: 59 inches

Long: 60 inches




Down certified to the Responsible Down Standard (RDS)

Contains recycled materials

7 reviews with an average rating of 4.7 out of 5 stars

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