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Thermarest
Thermarest Boost 650 20F/-6C Sleeping Bag | Extra Wide - 3 Lengths
Thermarest Boost 650 20F/-6C Sleeping Bag | Extra Wide - 3 Lengths
- High Quality Materials
- Klarna Pay Available
- Free delivery over £50
Regular price
£297.00 GBP
Regular price
£330.00 GBP
Sale price
£297.00 GBP
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Ultra-comfy warmer weather backpacking sleeping bag with adjustable shape and warmth.
- Customizable Comfort: Enjoy the spacious freedom of the semi-rectangular bag or the cozy warmth of a mummy bag—pick the shape and temperature that keeps you comfy at night with just a zip.
- WarmZip™ Tech: Patent-pending center zipper design zips up to reduce the bag’s internal space and tuck insulation around the sleeper to boost warmth by up to 10F/6C.
- Multi-Use Arm Holes: Reach the WarmZip, read a book, play cards or simply ventilate—do it all while tucked into your sleeping bag for elevated livability.
- Plush & Puffy: 650-fill, RDS-certified hydrophobic down is allocated to key areas with Zoned Insulation for refined heat efficiency and maximum coziness.
- Eco-Conscious Materials: Shell and liner are made of GRS-certified, 100% recycled, soft-to-the-touch nylon and coated with PFAS-free water repellent.
- Inclusive Sizing: Each length—Short, Regular, Long—is also available in a Wide width, so you get the bag you want in the fit you need.
- Additional Features: YKK anti-snag zippers, cinchable hood, zipper draft tube, puffed draft collar, and a two-way entry zipper.
- What's Included:
✓ Compression Sack
✓ Storage Sack


Tech Specs
Regular Wide | Short Wide | Long Wide | |
Weight (Metric) | 1.52 kg | 1.27 kg | 1.74 kg |
Length (Metric) | 203 cm | 188 cm | 216 cm |
Fits (Metric) | 183 cm | 168 cm | 198 cm |
Girth Shoulder (Metric) | 193 cm | 191 cm | 196 cm |
Girth Hip (Metric) | 188 cm | 185 cm | 191 cm |
Girth Foot box (Metric) | 155 cm | 155 cm | 155 cm |
Packed dimension (Metric) | 34cm x 19cm | 25cm x 17cm | 37cm x 19cm |
EN Comfort (C) | 0 C | 0 C | 0 C |
EN Limit (C) | -6 C | -6 C | -6 C |
EN Extreme (C) | -23 C | -23 C | -23 C |
Fill material | 650 Fill Duck PFAS Free Hydrophobic Down, RDS | 650 Fill Duck PFAS Free Hydrophobic Down, RDS | 650 Fill Duck PFAS Free Hydrophobic Down, RDS |
Fill weight (Metric) | 0.91 kg | 0.77 kg | 1.03 kg |
Shell fabric | 20D 100% Recycled Nylon Rip Stop | 20D 100% Recycled Nylon Rip Stop | 20D 100% Recycled Nylon Rip Stop |
Lining fabric | 20D 100% Recycled Nylon Rip Stop | 20D 100% Recycled Nylon Rip Stop | 20D 100% Recycled Nylon Rip Stop |
Zipper side | Left | Left | Left |
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