Thermarest Boost 650 -6C Long Down Sleeping Bag

Enjoy adaptable comfort in the backcountry with the Therm-a-Rest Boost 650 -6°C Long Down Sleeping Bag. Designed for three-season backpacking, the Boost 650 combines a roomy semi-rectangular shape with Therm-a-Rest’s innovative WarmZip™ technology, allowing the bag to transform into a more thermally efficient mummy-style shape when temperatures drop.

The WarmZip™ centre zipper reduces the amount of interior space your body needs to heat and pulls insulation closer around you, providing up to 6°C / 10°F of additional warmth. Multi-use arm openings allow you to access the zipper, ventilate, read, or reach gear without leaving the comfort of the sleeping bag.

Insulated with 650-fill RDS-certified hydrophobic duck down, the Boost 650 uses Zoned Insulation to concentrate warmth where it is most effective. The shell and lining are made from soft 20D 100% recycled nylon ripstop with a PFAS-free water-repellent treatment for added protection in variable conditions.

The Long size accommodates users up to approximately 6'6" / 198 cm, making it a comfortable option for taller campers and backpackers.

Features

• 20°F / -6°C EN Limit rating

• 32°F / 0°C EN Comfort rating

• Long size fits users up to 78" / 198 cm

• Overall length: 85" / 216 cm

• Weight: 3 lb 1 oz / 1.40 kg

• 650-fill RDS-certified hydrophobic duck down

• Down fill weight: 1 lb 10 oz / 733 g

• WarmZip™ technology can boost warmth by up to 10°F / 6°C

• Converts from roomy semi-rectangular shape to a warmer mummy-style fit

• Multi-use arm openings for ventilation and access

• Zoned Insulation concentrates down in key warmth-retention areas

• Cinchable hood

• Insulated draft collar and zipper draft tube

• YKK anti-snag zippers

• Two-way side zipper

• 20D 100% recycled nylon ripstop shell and lining

• PFAS-free water-repellent treatment

• Packed size: approximately 13" x 7.5" / 33 x 19 cm

• Includes compression sack and storage sack

• Colour: Morning Blue

The Therm-a-Rest Boost 650 -6°C Long offers an excellent balance of room, warmth, and packability, with an adjustable design that lets you choose between extra sleeping space and greater thermal efficiency as conditions change.