Therm-a-Rest Boost 650 32F/0C Down Sleeping Bag (Regular) – Adjustable Warmth & Comfort

Meet the Therm-a-Rest Boost 650 32F/0C Down Sleeping Bag, Regular — a backpacking essential that blends generous space with adaptable warmth. Designed for sleepers who want options, this bag invites you to tailor your night’s comfort to the conditions around you, helping you rest more soundly after a day on the trail.

Customize warmth and space

The Boost 650 starts in a spacious semi-rectangular shape that gives you room to side sleep, shift positions, and stretch out. With the WarmZip center zipper, you can transform the bag into a thermally efficient mummy, pulling insulation closer to your body and reducing the space your body has to heat. This configuration can add up to 10F (6C) to the Boost’s temperature rating, offering a practical option for colder conditions or longer nights.

• Adjustable shape with WarmZip for versatile warmth options
• Inclusive sizing including Wide options for broad shoulders or restless sleepers
• Arm holes enable easy access to the zipper and ventilation as needed
• Two way side zipper allows venting at torso or feet

Other thoughtful details include a puffy draft collar, a draft tube along the zipper line, and a cinchable hood. Hydrophobic 650 fill down is zoned to keep your core areas warm while reducing heat needs in less critical zones, helping you stay comfortable in varied backcountry weather.

• 650 fill hydrophobic down targeted for warmth where it counts
• YKK anti-snag zippers reduce snags and tears
• Shell and liner made from 100% recycled nylon with PFAS-free DWR
• Lightweight, packable design suited for backpacking

In practice, the Boost 650 balances warmth with weight: the regular size weighs about 2 lb 2 oz and packs down compactly to a 12.5 x 7.5 in volume. The shell and liner feel soft to the touch, and the PFAS-free DWR coating helps shed moisture in damp conditions without compromising performance.

Materials, sustainability, and packing

Durable, lightweight materials support backcountry versatility. The 100% recycled nylon shell and liner offer a soft feel without adding bulk, while the hydrophobic down helps you stay warm in damp weather. The bag includes a storage bag and compression stuff sack for efficient packing, and its 80 x 32 in dimensions provide ample space in moderate conditions. The WarmZip design and the versatile shape pairing align with Therm-a-Rest thoughtful approach to comfort, practicality, and responsibility in outdoor gear.