When a fast-and-light alpine objective or a demanding multi-day backcountry route demands the best sleep possible at the lowest weight, the Therm-a-Rest Parsec 20°F/-6°C is the bag to reach for.

The upgrade to 900-fill PFAS-free hydrophobic duck down is the headline here, delivering more loft and compression than the previous version in a shell that weighs just 1 lb 13 oz in the Regular size. The updated baffle structure works alongside Zoned Insulation to concentrate fill over your core and shoulders where heat retention matters most, trimming weight without creating vulnerable cold spots. The down-lined Toe-asis foot pocket rapidly warms cold feet by concentrating insulation in the footbox, and an internal stash pocket keeps a phone or small water filter protected from the cold overnight.

The 100% recycled 20D nylon ripstop shell and lining keep the environmental footprint in check while staying light, soft, and durable across repeated backcountry trips. YKK anti-snag zippers, a cinchable hood, and draft tubes along both the zipper and neck seal in warmth on cold nights. Quilt and blanket loops allow you to layer additional Therm-a-Rest pieces for colder conditions. Available in Regular and Long.

• Temperature rating: 20°F/-6°C (EN Comfort 29°F/-1°C, EN Limit 18°F/-8°C)
• Fill: 900-fill PFAS-free hydrophobic duck down (RDS certified)
• Shell and lining: 100% recycled 20D nylon ripstop with DWR
• Regular: 1 lb 13 oz (820g), fits to 6'0" (183 cm), packed 7 x 10.5 in
• Long: 1 lb 15 oz (886g), fits to 6'6" (198 cm), packed 7 x 10.5 in
• Toe-asis down-lined foot warmer pocket
• Internal stash pocket
• YKK anti-snag zipper, cinchable hood, draft tubes
• Includes compression sack and storage sack