Therm-a-Rest Parsec 32F/0C Ultralight Down Mummy Sleeping Bag — Long, Larch

Meet the Parsec 32F/0C Ultralight Down Mummy Sleeping Bag

Designed for warm-weather nights and shoulder-season journeys, the Therm-a-Rest Parsec 32F/0C Ultralight Down Mummy Sleeping Bag in Long, Larch is built to help you move light without sacrificing comfort. It shines on summer alpine bivouacs, where a featherweight bag that nests easily in a pack can feel almost like a second skin. The long cut provides full coverage for taller sleepers, while the soft 20D recycled nylon shell keeps weight down and adds a touch of breathability. Inside, the balance of warmth and airiness is achieved without bulk, inviting restful sleep after a day of climbing or trekking.

Core warmth comes from 800-fill Nikwax Hydrophobic Down, which repels moisture and dries faster than traditional down. This hydrophobic treatment reduces water absorption by about 90% and speeds evaporation, helping you stay warmer when you encounter mist, damp ground, or twilight dew. The down is PFC-free and RDS-certified, aligning performance with responsible sourcing. The shell uses GRS-certified 100% recycled nylon, which lowers environmental impact while maintaining durability and softness against the skin. The combination of materials keeps the bag remarkably light for its temperature rating, so you can focus on your route rather than your gear.

Smart design for warmth and ease

• Anti-snag YKK zipper ensures smooth entries and exits without tearing the fabric.
• Ultralight SynergyLink Connectors attach the bag to your sleeping pad for stability and reduced drafts.
• Heat-mapped Zoned Insulation places down where it matters, trimming weight while maximizing warmth.
• Toe-asis Foot Warmer pockets keep toes cozy on chilly nights.

Versatile features for custom comfort

• Quilt and blanket loops enable layering with quilts or lightweight blankets for added warmth.
• 20D recycled nylon shell is soft, durable, and eco-conscious.
• PFC-free materials and RDS-certified down support responsible performance.

In practice, the Parsec shines when you want a compact sleep system that adapts to conditions. On a dry, clear night, it feels roomy and breathable; in damp air, the down dries quickly and maintains warmth. The long cut minimizes drafts and allows free movement, while the connectors keep the bag aligned with your pad for more consistent warmth. Pair it with a light quilt for added warmth on breezy evenings or layered quilts for extra insulation when temps dip. The Parsec is built to travel with you—compact, reliable, and ready for alpine sunsets or cool morning starts.

Note: Materials are designed to help with warmth and dryness, but individual comfort depends on conditions and personal preference.