Thermarest Questar 20F/-6C

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As low as €274.46 Regular Price €304.95
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More Information
Insulation Down
Comfort temperature -10° / 0°
Weight 750 - 1000g

Quick overview

The Thermarest Questar 20 sleeping bag makes the perfect partner for experiencing the joy of the backcountry.

It is loaded with the comfort features that Therm-a-Rest bags are known for. The SynergyLink™ Connectors integrate the bag with your sleeping pad while allowing the Zoned Insulation to keep fill where you need it most. The fit of the bag has been perfected in the Thermarest onsite cold chamber to create the W.A.R.M. fit and allowing room for multiple sleep positions without compromising thermal efficiency.

Stuffed with water-resistant 650 fill Nikwax Hydrophobic Down certified by the Responsible Down Standard, the four-season Questar 20 is ready for your next backcountry adventure. The Questar is offered in three sizes, and designed to fit both men and women. 


Mummy sleeping bag
A mummy-shaped sleeping bag offers several advantages. The close-fitting shape means there is less room for air in the sleeping bag. You'll have the air that's in there up to temperature faster, making the sleeping bag warmer than a rectangular model. Also, most mummy sleeping bags come with a hood and a collar just above the shoulders that you can tighten. These features keep the heat trapped inside the sleeping bag and protect your head and neck, where you lose the most heat. The tapered shape reduces weight and volume in your backpack, bike pannier or car trunk.

Down insulation has an excellent insulation-to-weight ratio. It is very compressible, so a bulky, warm sleeping bag, can still be reduced to a small, manageable package. Also, the weight of a down-filled sleeping bag is much lower than that of a synthetic-filled sleeping bag with a similar temperature range. The temperature range of down is greater than synthetic materials such as polyester. This means that a warm sleeping bag can be used comfortably even at higher temperatures. Finally, down has a much longer lifespan.


  • 650 Fill Nikwax Hydrophobic Down™: Absorbs 90% less water and dries 3 times faster without using dangerous PFCs
  • W.A.R.M. Fit: With Additional Room for Multiple positions (W.A.R.M.) fit means this bag allows for various natural sleep positions while maintaining thermal efficiency
  • SynergyLink™ Connectors: Integrate the bag with a pad for optimal comfort and thermal efficiency; removable for versatility
  • Zoned Insulation: Maximizes warmth and saves weight by intentionally placing down where you need it most
  • Box Baffled Construction: Uses mesh walls to maximize loft and minimize cold spots
  • Toe-asis™ Foot Warmer Pocket: Baffled pocket of insulation rapidly warms cold feet
  • Quilt and Blanket Loops: Customize your sleep system by layering our quilts or tech blankets for increased warmth
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely
  • Additional features: Heat-trapping draft collar, full-length zipper draft tube, snag-free zipper, cinchable hood and external zip pocket
  • Compression sack and storage sack included
Thermarest Questar 20F/-6C S R L
Comfort °C 0 °C
Limit °C -6 °C
Extreme °C -23 °C
Fill weight (grams) 470 540 610
Weight (grams) 840 990 1120
Insulation material 650-Fill Nikwax Hydrophobic Down™, RDS
Up to bodysize (cm) 168 183 198
Girth @ shoulder / hip / foot (cm) 147 / 147 / 112 160 / 155 / 117 168 / 163 / 130
Packed dimensions (cm) 19x23
Intended use Trek & Travel