Therm-a-Rest Boost 650 20F/-6C Down Sleeping Bag, Large Wide

About this item

Comfort is not ‘one size fits all’, which is why the Boost 650 empowers you to customize its shape to find your perfect balance of space and warmth. As a spacious semi-rectangular sleeping bag the Boost provides all the room you need to side sleep, shift about, spread out and relax. The semi-rectangular shape gives you considerably more internal space than a mummy bag. But more space demands more body heat to warm it up and cold isn’t comfortable. Zipping up the WarmZip center zipper transforms the shape of the Boost 650 from a semi-rectangular bag to a thermally efficient mummy bag. It pulls the 650-fill down around your body and reduces the amount of space your body needs to heat. WarmZip gives you the power to add up to 10F/6C to the Boost’s temperature rating. Standard Therm-a-Rest features like a puffy draft collar, a draft tube along the entry zipper line and a cinchable hood round out the Boost’s bliss-inducing comfort. The arm holes give you easy access to the WarmZip without having to use the side zipper. The arm holes also let you ventilate or comfortably sleep with just your arms out. You can also ventilate around your torso or down by your feet with the two-way side zipper. Every zipper has a durable YKK anti-snag pull to eliminate annoying snags and damaging tears. The Boost 650 was built to be a backpacking sleeping bag. We dialed in the materials and design to make it lightweight, packable and high-performing in variable backcountry conditions. Zoned Insulation places the 650-fill hydrophobic down in key warmth-retention areas (on top, around your core and shoulders) and reduces it where it’s less efficient (on the bottom), allowing the Boost to create more warmth with less down. The shell and liner are made of 100%-recycled nylon that was handpicked for its light weight and super-soft feel. The PFAS-free DWR coating and the hydrophobic down keep the Boost warm and comfy even in wet weather.

• 100% Recycled Nylon
• Imported
• Built for everybody and bodies of all shapes and sizes, the Boost 650 is an ultra-comfortable backpacking sleeping bag with adjustable shape and warmth
• WarmZip Tech is our patent-pending center zipper that can reduce the bag's internal space and tuck insulation around the sleeper to boost warmth by up to 10 degrees F (6 degrees C)
• An inclusive size range that includes Wide sizes for every length, as well as the centered WarmZip zipper, increases comfort for people with broad shoulders, those who toss and turn, and everyone who wants more room than a traditional mummy sleeping bag
• Multi-use arm holes make it easy to reach the WarmZip, read, make coffee, or play cards all while keeping warmth in and cold out
• 650 fill, RDS-certified down is hydrophobic to help keep you dry in inclement weather and is allocated to key areas for maximum heat efficiency and comfort

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