Thermarest - Boost 650 32F/0C Meadow Green - Regular - Sleeping bag

Comfort isn’t one-size-fits-all, which is why the Boost 650 is designed to let you tailor its shape for the perfect balance of space and warmth. As a roomy semi-rectangular sleeping bag, it gives you the freedom to side sleep, shift positions, and stretch out without feeling restricted-offering significantly more space than a traditional mummy bag. But extra room requires more body heat to stay warm, and that’s where WarmZip technology comes in. By zipping up the WarmZip center zipper, the Boost 650 transforms from a spacious semi-rectangular bag into a thermally efficient mummy shape. This adjustment pulls the 650-fill down insulation closer to your body, reducing the space that needs to be heated and boosting warmth by up to 10°F (6°C). Additional warmth-enhancing features-like a plush draft collar, a full-length draft tube, and a cinchable hood-ensure ultimate comfort throughout the night. The Boost 650 isn’t just about sleeping-it’s built for comfort whether you’re dozing off, fast