Great layered under our longer shells or as a packable standalone for camp and rest phases, our longest Cerium extends coverage while delivering exceptional warmth for its weight. Responsibly sourced 850-fill goose down – with synthetic insulation in areas prone to moisture – provides the warmth. The 15D Arato outer is light, durable, and made with 100% recycled nylon. An insulated StormHood extends coverage, the two-way front zipper adds freedom of stride, and the streamlined fit layers easily.