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Therm-a-Rest Questar 20 Down Sleeping Bag (-6C)

Therm-a-Rest Questar 20 Down Sleeping Bag (-6C)
$322.46 - $352.46
$429.95 - $469.95
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This is the field-proven, feature-packed down bag you've always wanted. Thermaerst has loaded this bag with the comfort features that their bags are known for.

Thermarest SynergyLink™ Connectors integrate the bag with your sleeping pad while allowing our Zoned Insulation to keep fill where you need it most.

The fit of the bag has been perfected in our onsite cold chamber to create the Thermarest W.A.R.M. fit that allows 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 Questar is ready for your next backcountry adventure.

The Questar is offered in three sizes, and designed to fit both men and women.

Compression sack and storage sack included.

Weight (Reg) - 990g / 2.19lbs
Fill: 650 Fill Power Nikwax Hydrophobic RDS Duck Down
Fill Weight: 540g / 1.19lbs

  • 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


Recommended Use



Three Season (-1C to -15C)

Temperature Rating


Comfort Limit


Lower Limit




Insulation Type

650+ Fill Power

Nikwax Hydrophobic Duck Down


Small - 0.84 kg / 1.85lbs

Regular - 0.99 kg / 2.18lbs


Long – 1.12 kg / 2.46lbs

Fill Weight

Small: 0.47 kg/ 1.03 lbs

Regular: 0.54 kg/ 1.19 lbs

Long: 0.61 kg/ 1.34 lbs



Fits to User Height

Small - 168cm /66”

Regular - 183cm /72”

Long - 198cm / 78"




Small - 185 cm / 73"

Regular - 203 cm / 80"

Long - 216 cm / 85"



Small - 147 cm / 58"

Regular - 160 cm / 63"

Long - 168 cm / 66"




Small - 147 cm / 58"

Regular - 155 cm / 61"

Long - 163 cm / 64"




Small - 112 cm / 44"

Regular - 117 cm / 46"

Long - 130 cm / 51"



Stuff Sack Size

19 x 23cm / 7.5 x 9"

Packed Volume

14.8 liters



20D Polyester w/ DWR


20D Polyester Taffeta


Thermarest Questar Sleeping Bags

Part Numbers

Option UPC MPN Store SKU
Small 040818131558 13155 SLE513900720
Regular 040818131565 13156 SLE517484460
Long 040818131572 13157 SLE524963150