The Women's Arc'teryx Atom SL Hoodie is a packable, insulated jacket for cold, wet weather pursuits. Adventure into the woods or mountains, and the stretch synthetic insulation will offer warmth on cool to cold days, even if it gets wet. The Fortius Air 20 face fabric is weather-resistant, plus stretchy for unrestricted movement. Excess heat easily escapes from the Octa fleece side panels, and when the day (or physical effort) gets really warm, the whole jacket can be stuffed inside your pack for later.