Light and warm, our most versatile synthetically insulated jacket performs as a midlayer and standalone across a range of mountain activities.. Updates include a more streamlined fit for improved mobility and comfort under layers, a light, breathable 30D face fabric, and a PFAS-free FC0-DWR (Durable Water Repellent) finish. Arc'teryx Atom Jacket Womens | Black | X-Small | Christy Sports