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Thermarest Questar 20F/-6C

Size: Small

The Thermarest Questar 20F/-6C is a 4-season down sleeping bag, fully featured for backpacking adventures. 

Loaded with comfort features the Thermarest Questar 20F/-6C is the field-proven, feature-packed down bag you've always wanted. The perfect partner for experiencing the joy of the backcountry, the Zoned Insulation will keep fill where you need it most. The fit of the bag has been perfected to create a W.A.R.M. fit, allowing room for multiple sleep positions without compromising thermal efficiency. Stuffed with water-resistant 650 fill, the four-season 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.

More Help? 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: Down Sleeping Bags.


  • 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: Maximises warmth and saves weight by intentionally placing down where you need it most.
  • Box Baffled Construction: Uses mesh walls to maximise loft and minimise cold spots.
  • Toe-asis Foot Warmer Pocket: Baffled pocket of insulation rapidly warms cold feet.
  • Quilt and Blanket Loops: Customise 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, cinch-able hood and external zip pocket.
  • Compression sack and storage sack included


  Small Regular Long
Colour Balsam Balsam Balsam
Weight (Standard) 1 lbs 14 oz 2 lbs 3 oz 2 lbs 7 oz
Weight (Metric) 0.84 kg 0.99 kg 1.12 kg
Width (Standard) 29 in 31.5 in 33 in
Length (Standard) 73 in 80 in 85 in
Height (Standard) 4.5 in 4.5 in 4.5 in
Fits (Standard) 66 in 72 in 78 in
Fits (Metric) 168 cm 183 cm 198 cm
Girth, Shoulder (Standard) 58 in 63 in 66 in
Girth, Shoulder (Metric) 147 cm 160 cm 168 cm
Girth, Hip (Standard) 58 in 61 in 64 in
Girth, Hip (Metric) 147 cm 155 cm 163 cm
Girth, Foot box (Standard) 44 in 46 in 51 in
Girth, Foot box (Metric) 112 cm 117 cm 130 cm
Packed dimension (Standard) 7.5 x 9 7.5 x 9 7.5 x 9
Packed dimension (Metric) 19 x 23 19 x 23 19 x 23
Recommended Temperature Comfort (F) 32 32 32
Recommended Temperature Comfort (C) 0 0 0
Recommended Temperature Limit (F) 20 20 20
Recommended Temperature Limit (C) -6 -6 -6
Fill material 650 Fill Nikwax Hydrophobic Down RDS 650 Fill Nikwax Hydrophobic Down RDS 650 Fill Nikwax Hydrophobic Down RDS
Fill weight (Standard) 1 lbs 1 oz 1 lbs 3 oz 1 lbs 6 oz
Fill weight (Metric) 0.47 kg 0.54 kg 0.61 kg
Shell fabric 20D Polyester w/ DWR 20D Polyester w/ DWR 20D Polyester w/ DWR
Lining fabric 20D Polyester Taffeta 20D Polyester Taffeta 20D Polyester Taffeta

Personal Shopping - By Appointment

Would you like to try on some climbing shoes, running 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.

Customer Reviews

Based on 1 review
Alexander O.
It’s good but not great

The bag is warm but not that long for an average person. The zip comes undone easily and it’s not very broad around the shoulders. But it performed well in cold temperatures.