Thermarest Questar 0F/-18C

Thermarest Questar 0F/-18C

Packed with features needed for cold-weather camping, the Questar 0 offers supreme comfort and versatility for your next adventure.

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The opinion of Aventure Nordique

Versatile and lightweight sleeping bag for cold weather camping and backpacking. The Questar uses water resistant Nikwax Hydrophobic Down to keep you warm.


  • 650 fill Nikwax Hydrophobic Down: Stays drier and maintains loft 60 times longer than untreated down.

  • ThermaCapture Seams: Traps radiant body heat and retains warmth without adding bulk or weight.

  • SynergyLink Connectors: Integrate the bag with a mattress for optimal comfort and efficiency; removable for versatility.

  • Zoned Insulation: Maximizes warmth and saves weight by intentionally placing fill where you need it most.

  • Quilt and Blanket Loops: Customize your sleep system by layering our quilts or tech blankets for increased warmth.

  • Toe-asis Foot Warmer Pocket: Ergonomic toe box that rapidly warms cold feet in a pocket of warm down.

Technical details

Manufacturer Therm-A-Rest
Product name Questar 0F/-18C
Season 4 season
Model Unisex
Fill Duck Down
Cuin 650 Cuin Nikwax Hydrophobic RDS
Comfort rating -10°C
Comfort Limit -18°C
Dimensions S : 185 x 74 cm (Fits up to. 168cm) - M : 201 x 80 cm (Fits up to. 183cm) - L : 216 x 84 cm (Fits up to. 198 cm)
Shoulders - Hips - Feet: S : 147/147/112 cm - R : 160/155/117 cm - L : 168/163/130 cm
Folded size S : 23 x 36 cm - M : 23 x 36 cm - L : 23 x 36 cm
Outer shell 20D RipStop Polyester w/DWR
Inner lining 20D Polyester Taffeta, Printed
Fill Weights S : 750 g - R : 820 g - L : 890 g
Weight S : 1170 g - R : 1210 g - L : 1380 g
Colour Green
Additional information

Zoned Insulation: (650 Fill Nikwax Hydrophobic Down), ThermaCapture Seams, Removable SynergyLink mattress straps, Quilt & Blanket Loops, Toe-asis foot warmer, Toe-Tilt, Oversized Zipper Draft Tube, snag free zipper, external zip pocket. Available in three sizes. Stuff sack and storage sack included.

Warranty Lifetime
Country of Manufacture China


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