The Feathered Friends Arctic Finch EX -10 is a women-specific expedition sleeping bag handmade in Seattle for the coldest conditions — winter mountaineering and expedition use. The fill is 850 g of goose down at 900+ fill power (RDS-certified), distributed evenly across the bag by continuous baffle construction, with a manufacturer-rated limit temperature of -23°C.
The cut is dedicated women's sizing — a short length for users up to 160 cm and narrower proportions that reduce dead air space and, with it, the down needed to stay warm. Total weight is 1423 g for a -23°C rating, working out to just under 62 g per degree, a strong figure for a down-filled expedition bag. The Pertex Shield EX shell is a waterproof, breathable membrane that protects the down from outside moisture — a critical feature in winter use, where condensation and snow contact are constant risks.
A contoured hood, draft collar, draft tube along the zipper, and a two-way YKK zipper are standard expedition-grade features; an internal pocket and two sacks (stuff sack and storage sack) round out the package. Given these specs, this is clearly a specialized tool for winter mountains rather than an all-around three-season bag.