Therm-A-Rest Boost 32F / 0C Down Sleeping Bag

FROM BACKPACKING TO CAR CAMPING, THE BOOST 650 OFFERS THE COMFORT YOU NEED TO SLEEP WELL OUTDOORS.

The Boost is crafted with an innovative design that allows you to customise its shape and add warmth whenever you need it, making it one of the most comfortable and versatile sleeping bags ever created. Thanks to its semi-rectangular shape, it offers much more internal space than a traditional mummy bag, giving you the freedom to sleep in any position you prefer—whether side-sleeping, curled up, or fully stretched out.

This extra space means you won’t feel restricted or cramped, allowing you to sleep soundly and comfortably throughout the night. However, with more space comes the need for more warmth to keep you cosy, and that’s where the Boost really shines. Its thoughtful design ensures that you stay warm and comfortable by letting you adjust the warmth to suit your needs, making sure you get the best rest, no matter the weather conditions.

Explore our full range of Sleeping Bags and Quilts here.

KEY FEATURES OF THE BOOST 650

• 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 made 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.

Sleeping Bag Ratings explained here.