Boost 650 20F/-6C | Backpacking Sleeping Bag | Therm-a-Rest
The ultra-comfortable Boost 650 20F/-6C backpacking sleeping bag features customizable shape and warmth for versatile three-season camping adventures.
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. With considerably more internal space than a mummy bag, you’ll feel unrestricted and free to sleep in whatever position you want all night long. But more space demands more body heat to warm it up and cold isn’t comfortable. That’s where WarmZip comes in. 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.
We designed the Boost 650 to be comfortable when you’re falling asleep, when you’re asleep and when you’re wide awake and hanging out in your tent. The arm holes give you easy access to the WarmZip without having to use the side zipper. They also allow you to access your belongings, read a book, play cards or high-five your friends without leaving the cozy warmth of your sleeping bag. Getting too warm? Use the arm holes to 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 line on the Boost has a durable YKK anti-snag pull to eliminate annoying snags and damaging tears.
All that comfort must be bulky and heavy, right? Think again. The Boost 650 was built to backpack—we dialed in the materials and design to make it light, 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.
WarmZip™
Patent-pending center zipper allows you to choose a semi-rectangular or mummy shape, or somewhere in between. Boosts the bags warmth by up to 10F/6C when zipped up in the mummy shape.
Arm Holes
Access the WarmZip, ventilate, read a book, play cards or high five your friends—all without leaving the warmth of your sleeping bag. Arm holes make being in your bag and living in a tent comfy and easy.
Humanely Sourced Down Insulation
650-fill hydrophobic down is certified to be sourced from humanely treated waterfowl by the Responsible Down Standard (RDS).
100% Recycled Nylon
Shell and liner are certified 100% recycled by the Global Recycle Standard. Recycled nylon is made of plastic bottles and reduces water and energy waste in the textile supply chain.
Features:
· 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.
Color - Morning Blue
Weight - Short - 2lb 4oz | Short Wide - 2lb 13oz | Regular - 2lb 11oz | Regular Wide - 3lb 5oz | Long - 3lb 1oz | Long Wide - 3lb 13oz
Width -
Length - Short - 73" | Short Wide - 73" | Regular - 80" | Regular Wide - 80" | Long - 85" | Long Wide - 85"
Fits - Short - 66" | Short Wide - 66" | Regular - 72" | Regular Wide - 72" | Long - 78" | Long Wide - 78"
Girth, Shoulder - Short - 63" | Short Wide - 75" | Regular - 64" | Regular Wide - 76" | Long - 65" | Long Wide - 77"
Girth, Hip - Short - 59" | Short Wide - 73" | Regular - 60" | Regular Wide - 74" | Long - 61" | Long Wide - 75"
Girth, Foot box - Short - 61" | Short Wide - 61" | Regular - 61" | Regular Wide - 61" | Long - 61" | Long Wide - 61"
Packed dimension -
EN Comfort - 0C / 32F
EN Limit - -6C / -21F
EN Extreme (Not Recommended) - -9F / -23C
Fill material - 650 Fill Duck PFAS Free Hydrophobic Down, RDS
Fill weight -Short - 1lb 4oz | Short Wide - 1lb 11oz | Regular - 1lb 7oz | Regular Wide - 2lb | Long - 1lb 10oz | Long Wide - 2lb 4oz
