Therm-a-Rest Polar Ranger -20 Sleeping Bag

Color: Orange
Size: Regular
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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.

  • Features

    • 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


    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 Therm-a-Rest Backpacking Sleeping Bags
  • Technical Specs

    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.


    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

    Shoulder Girth (in.)

    Regular: 64 inches

    Hip Girth (in.)

    Regular: 59 inches




    Down certified to the Responsible Down Standard (RDS)

    Contains recycled materials

  • Reviews
    3 reviews with an average rating of 5.0 out of 5 stars

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