kelty COSMIC ULTRA 0

The Kelty Cosmic Ultra 0 is a winter mummy bag filled with a substantial 1000 g of 800-fill hydrophobic DriDown. The manufacturer rates it to -8°C comfort / -15°C limit, placing it in the four-season winter category for cold treks and high-altitude bivouacs. At 1830 g total, it's reasonably light for a down bag in this temperature class, and its 8.2 warmth-to-weight ratio is among the better figures in this range. The 20D nylon ripstop shell and matching liner carry a PFC-free DWR finish. Horizontally oriented trapezoidal baffles limit down migration, and the two-way zipper has a left-side anti-snag slider backed by a full draft collar and draft tube. An adjustable contoured hood, internal pocket, and stuff sack are included; internal length is 198 cm, with shoulder/hip/foot dimensions of 158/147/102 cm. It's a unisex bag rated to 183 cm user height, built without recycled materials and with no RDS down-sourcing certification listed — the focus here is purely thermal performance at a manageable weight for serious winter conditions.