Thermarest Boost 650™ 32F/0C Sleeping Bag

From backpacking trips to car camping excursions, the Boost 650 provides the dreamy comfort you need to sleep well outdoors. With an innovative design that allows you to adjust its shape and add warmth when needed, the Boost is one of the most comfortable and versatile sleeping bags ever made. The semi-rectangular shape gives you 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 centre 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 Thermarest 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. 

Thermarest 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 cosy 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 - they 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.

Features

Ultra-comfy warmer weather backpacking sleeping bag with adjustable shape and warmth.

• Customisable Comfort: Enjoy the spacious freedom of the semi-rectangular bag or the cosy warmth of a mummy bag - pick the shape and temperature that keeps you comfy at night with just a zip. 
• WarmZip™ Tech: Patent-pending centre 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 liveability. 
• Plush & Puffy: 650-fill RDS-certified hydrophobic down is allocated to key areas with Zoned Insulation for refined heat efficiency and maximum cosiness. 
• Eco-Conscious Materials: Shell and liner are of GRS-certified 100% recycled, soft-to-the-touch nylon and coated with PFAS-free water repellent. 
• Inclusive Sizing: Each size - Small, Regular, Long - is also available in a Wide size, 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. 

What's Included: 

• Compression Sack
• Storage Sack

Specifications

Video