The Ultralight Down Vest is built with the toughest, lightest-weight nylon fabric that Patagonia has ever used, and insulated with highly compressible 800-fill-power 100% Traceable Down (goose down that can be traced back to birds that were never force-fed, never live-plucked). With its slim, thermally efficient silhouette, it stands alone or layers easily in colder condition. A climb in the Mont Blanc massif can blend four seasons in a single day. The Ultralight Down Vest will block the wind and trap core warmth when temperatures plunge. High-lofting, extremely compressible 800-fill-power 100% Traceable Down is encased in an ultralight nylon ripstop shell that’s tough for its weight and sheds moisture with a DWR (durable water repellent) finish. The elegant low-profile silhouette has feminine shaping, is thermally efficient, and is complemented by variegated channel construction that uses less down while remaining warm. The vest slides easily over light layers or under a shell and has two zippered handwarmer pockets, a drawcord hem and a stuffsack.