Thermarest Boost 650 -6C

The Thermarest Boost 650 -6C is designed for three-season adventures, this innovative sleeping bag redefines versatility with its adjustable shape and warmth. Whether you're a side sleeper, a restless mover, or simply someone who loves to sprawl out, the Boost 650's semi-rectangular design offers the space you need to sleep in total comfort. But what truly sets it apart is the WarmZip technology, a game-changing feature that lets you transform the bag into a thermally efficient mummy shape, adding up to 6°C of warmth when the temperature drops.

The Boost 650 isn't just about sleeping—it's about living comfortably in the outdoors. The multi-use arm holes allow you to access the WarmZip, read a book, or even play cards without leaving the cozy confines of your sleeping bag. Too warm? Use the arm holes or the two-way side zipper to ventilate and regulate your temperature. Every detail has been meticulously crafted for convenience, from the YKK anti-snag zippers to the cinchable hood and puffy draft collar. Plus, the zoned insulation ensures maximum warmth where you need it most, while the eco-conscious materials—100% recycled nylon shell and liner with PFAS-free DWR coating—make this bag as kind to the planet as it is to you. Lightweight, packable, and built for performance, the Boost 650 is your ticket to a restful night under the stars.

Thermarest Boost 650 -6C Features

• 20D 100% Recycled Nylon Rip Stop
• 650-fill, RDS-certified hydrophobic down
• 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
• YKK anti-snag zippers
• Cinchable hood
• Zipper draft tube
• Puffed draft collar
• Two-way entry zipper

Please note Extreme temperatures are at the point of danger to health.