In Store Purchase By Appointment

More Info


Thermarest Polar Ranger -20F/-30C

Size: Regular

The Thermarest Polar Ranger -20F/-30C is a fast and light down sleeping bag equipped to conquer the most extreme conditions known to man. For polar expeditions and high-altitude adventures that demand un-compromised warmth, the Thermarest Polar Ranger -20F/-30C has been designed with polar explorer Eric Larsen, to ensure that every component of the bag has been maximised for warmth even in Arctic settings. 

The Polar Ranger has been engineered with 800-fill Nikwax Hydrophobic Down, meaning it not only absorbs 90% less water than untreated down, but any moisture it does pick up will dry 3 times faster. A synthetic snorkel hood with magnetic closure helps seal in warmth, while keeping any exhaled moisture away from the bag. Side vents allow for custom ventilation should get get too warm, and free your arms while still in the bag. Thermarest's SynergyLink connectors link your bag to your sleeping bag, and as you'd expect there are also external loops to attach a quilt for extra warmth. FInally, the ergonomic Toe-asis foot pocket is designed around a baffled pocket of insulation to rapidly warm cold feet. Storage sack and compression stuff sack included.


The Thermarest Polar Ranger comes in two lengths, Regular and Long. See the table below, and Thermarest size guide in the image carousel. 


Check out the video below from Thermarest, detailing the features of the Polar Ranger.

Relevant Article 

For further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: A Guide to Down Sleeping Bags


  • Recycled Shell & Liner: GRS-certified 100% recycled fabrics are both eco-friendly and lightweight, soft and durable.
  • 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 Hydrphobic Down: Dries three times faster than untreated down without using dangerous PFCs.
  • SynergyLink ConnectorsIntegrate the bag with a mattress for optimal comfort and efficiency; removable for versatility.
  • 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.


Regular Long
Colour Flame
Weight (Standard) 3 lbs 4 oz 3 lbs 7 oz
Weight (Metric) 1.48 kg 1.56 kg
Width (Standard) 32 in 34 in
Length (Standard) 81 in 86 in
Height (Standard) 6.5 in 6.5 in
Fits (Standard) 72 in 78 in
Fits (Metric) 183 cm 198 cm
Girth, Shoulder (Standard) 64 in 68 in
Girth, Shoulder (Metric) 163 cm 173 cm
Girth, Hip (Standard) 59 in 60 in
Girth, Hip (Metric) 150 cm 152 cm
Girth, Foot box (Standard) 46 in 51 in
Girth, Foot box (Metric) 117 cm 130 cm
Packed dimension (Standard) 8.5 in x 10 in 8.5 in x 10 in
Packed dimension (Metric) 22 cm x 25 cm 22 cm x 25 cm
Recommended Temperature Comfort (F) -4 -4
Recommended Temperature Comfort (C) -20 -20
Recommended Temperature Limit (F) -20 -20
Recommended Temperature Limit (C) -30 -30
Fill material 800 Fill Goose Nikwax Hydrophobic Down RDS 800 Fill Goose Nikwax Hydrophobic Down RDS
Fill weight (Standard) 2 lbs 2 oz 2 lbs 4 oz
Fill weight (Metric) 0.97 kg 1.07 kg
Shell fabric 100% Recycled Nylon Ripstop w/DWR 100% Recycled Nylon Ripstop w/DWR
Lining fabric 100% Recycled Nylon Ripstop
100% Recycled Nylon Ripstop
Zipper side Center Center


Related Products 

Personal Shopping - By Appointment

Would you like to try on some climbing shoes or mountain boots for size before you make your purchase? If so, then why not book an appointment with us today! We can offer you a bespoke one-on-one shopping experience with one of our experienced staff members.