A down jacket from Outdoor Research, with a stand collar (no hood) and 800-fill responsibly sourced down under a Pertex Quantum ripstop nylon shell. It stuffs into its own pocket for packing and is listed for winter and alpine use.
What fill power measures, why the 900-fill Rab Mythic Ultra weighs more than twice as much as the 850-fill Western Mountaineering QuickFlash, and how to choose between down and synthetic. A comparison of published maker specs for seven insulated jackets.
Winter warmth comes from a system: stacked pads, insulation that copes with damp, a regulated stove and traction, built from products in our catalogue.
