If you're counting grams, but still count on a great night's sleep, the Spark may be the right bag for you. Filled with RDS-certified 850 fillpower goose down treated with a non-PFAS Ultra-Dry Down treatment, the Spark is constructed with a technical hood and zipper draft tube to retain warmth. Comfort comes from a super-breathable 10 denier liner fabric, while a 10D shell with a non-PFAS DWR plus a highly water repellent hood and footbox fabric shed wind and condensation. The full-length zipper model can be zipped to an equivalent Women's Spark for comfort that couples can share. 

Features

• RDS-certified, 850 fillpower goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance
• Ultralight, breathable 10D nylon liner and a 10D shell with PFAS-free DWR keeps the hood and footbox highly water resistant
• Technical hood, anatomical footbox and an ergonomic mummy shape - ultralight doesn't have to mean ultra tight
• YKK #5 zippers with zipper plow provide reliable, snag-free operation
• Baffle construction specific for each use: Sewn through for lighter weight (7°C|45°F), Hybrid box baffles in torso/sewn through in leg area (-1°C|30°F) or full box baffles for maximum warmth (-9°C|15°F)