The Thermarest Questar 0F / -18°C is a cold-weather, down-filled sleeping bag designed with extra width so you can move naturally and sleep the way you do at home. With an EN temperature rating of Comfort -10°C (Limit –18°C), it sits within the Questar range, which offers three temperature options to suit different conditions.
Suitable for plus size campers up to around size 20/22 (women), 2XL (men). Read this review from a size 20 female camper.
Pair with the Thermarest NeoAir Xtherm NXT MAX Sleeping Mat with R7.3 value for a warm night's sleep even in the deep winter.
Built for winter hillwalking, UK camping, and cold-weather mountaineering, the Questar –18°C is a reliable choice loaded with practical features to keep you warm and comfortable. Its fit has been fine-tuned in Thermarest’s on-site cold chamber to create the signature W.A.R.M. design, giving you space in the shoulders, hips, and foot box for multiple sleep positions—whether you curl up, sprawl out, or shift through the night. Or, if you're bigger in the body!
If you prefer your sleeping bag to stay anchored while you move inside it, the SynergyLink™ Connectors let you secure the bag to your sleeping mat.
Zoned insulation with box-wall construction keeps the down exactly where it’s needed, boosting warmth and complementing the thermal performance of your sleeping mat.
The fill itself is water-resistant 650-fill-power Nikwax Hydrophobic Down, certified to the Responsible Down Standard (RDS) for ethical sourcing.
Features:
- 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 efficiency and comfort; removable for versatility.
- Zoned Insulation: Maximizes warmth and saves weight by intentionally placing fill where you need it most.
- Box Baffled Construction: Uses mesh walls to maximize loft and minimize cold spots.
- Toe-asis™ Foot Warmer Pocket: Ergonomic toe box that rapidly warms cold feet in a pocket of warm down.
- 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
Not in stock? Contact to order it in for you (takes around 10 days).
