Sleep Your Way Under the Stars with the Boost 650™ Sleeping Bag

Customizable shape with WarmZip™ lets you switch from roomy to heat-locking mummy mode
Lightweight and packable with hydrophobic down for reliable warmth in the backcountry
Handy armholes and draft-blocking features keep you comfy all night (or day) long

The Therm-A-Rest Boost 650™ 20F/-6C Sleeping Bag gives you the freedom to sleep how you like—sprawled out, curled up, or zipped in tight for max warmth. With smart features that keep you warm, dry, and comfortable in any position, it's perfect for serious adventures without sacrificing a cozy night’s sleep.

tech specs

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.
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.
Reach the WarmZip, read a book, play cards or simply ventilate—do it all while tucked into your sleeping bag for elevated livability.
650-fill, RDS-certified hydrophobic down is allocated to key areas with Zoned Insulation for refined heat efficiency and maximum coziness.
Shell and liner are made of GRS-certified, 100% recycled, soft-to-the-touch nylon and coated with PFAS-free water repellent.
YKK anti-snag zippers, cinchable hood, zipper draft tube, puffed draft collar, and a Left-handed, two-way entry zipper.
Storage sack and compression sack included
32F Comfort, 20F Limit, -9F Extreme
Fill Material: 650-Fill Duck PFAS-Free Hydrophobic Down, RDS
Regular Weight: 2 lb 11 oz (1205 g)
Regular Fits User Height: 72 in (183 cm)
Regular Length: 80 in (203 cm)
Regular Shoulder Girth: 64 in (163 cm)
Regular Hip Girth: 60 in (152 cm)
Regular Foot Box Girth: 61 in (155 cm)
Regular Packed Dimensions: 12.5 x 7.5 in (32 x 19 cm)
Long: Weight: 3 lb 1 oz (1398 g)
Long Fits User Height: 78 in (198 cm)
Long Length: 85 in (216 cm)
Long Shoulder Girth: 65 in (165 cm)
Long Hip Girth: 61 in (155 cm)
Long Foot Box Girth: 61 in (155 cm)
Long Packed Diemsions: 13 x 7.5 in (33 x 19 cm)

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$250 to $350

Boost 650™ 20F/-6C Sleeping Bag

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