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Thermarest Polar Ranger -20 Down Sleeping Bag

-30°C Comfort Limit (EN13537:2012), 950g of 800+ Fill Power Down (US Method)
Weighs 1498g (excluding stuff sack)
Code: SS18057V
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Designed with polar explorer Eric Larsen, the Thermarest Polar Ranger -20 Down Sleeping Bag is equipped to conquer the most extreme conditions.

Therm-a-Rest says:

Polar expeditions and high-altitude adventures demand uncompromised warmth. The Polar Ranger was designed with polar explorer Eric Larsen to ensure that every component of the bag was maximized for warmth even in Arctic settings.

We engineered the bag with 800-fill Nikwax Hydrophobic Down and features like a synthetic snorkel hood to help you enjoy arctic expeditions. Explorers like Eric Larsen understand the severity of the arctic cold and they count on the uncompromising performance of the Polar Ranger. Storage sack and compression stuff sack included.

The Therm-a-Rest Polar Ranger is a -20F/-30C Down Sleeping Bag that's equipped to conquer the most extreme conditions during polar and mountaineering expeditions.

Using 800-fill Nikwax Hydrophobic Down and ThermaCapture heat-trapping technology throughout the entire bag, the Polar Ranger is equipped with every essential you need for extreme-cold camping. Touches like Thermarest's SynergyLink Connectors, Toe-asis foot warmer pocket and a unique synthetic snorkel hood designed to funnel air in a way that keeps condensation from chilling your face, are just a few ways the Polar Ranger keeps you warm and secure at frigid camps.

We particularly like the side vents as they are protected by overlapping draft tubes and allow you to eat or sort gear without having to leave your bag!

- Reviewed by Ultralight Outdoor Gear

Help and advice: Choosing a sleeping bag advice
  EN 13537 rating for sleeping bags explained
  Sleeping bag shape and sizes advice
  Sleeping Bag features Page 1
  All about down filling in sleeping bags
  • Overlapping Side Vents: Side vents open to allow arm use and customisable temperature control. Overlapping draft tubes prevent cold spots when zippers are closed.
  • Snorkel Hood: Controls frost created by breath and eliminates warmth-sapping cross drafts. Synthetic-filled snorkel resists moisture.
  • 800-fill Nikwax Hydrophobic Down: Dries three times faster than untreated down without using dangerous PFCs.
  • SynergyLink Connectors: Integrate the bag with a mattress for optimal comfort and efficiency; removable for versatility.
  • ThermaCapture Lining: Full-coverage lining traps radiant body heat and retains warmth without adding bulk or weight.
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely.
  • Additional features: Toe-asis Foot Warmer Pocket, Overstuffed draft tubes, Quilt and Blanket Loops.


  • Fits: 170cm - 183cm (5ft 7in - 6ft)
  • Girth: 157cm at shoulder, 145cm at hip, 117cm at foot
  • Fabric: 20D Polyester Ripstop w/ ThermaCapture coating
  • Fill: 800+ fill Nikwax hydrophobic down RDS w/ Thermacapture seams
  • Fill weight: 950g
  • Pack size: 41 x 23cm
  • Comfort rating: -20C
  • Comfort Limit: -29C
  • Weighs: 1498g
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