The Arc'teryx Atom Jacket - Women's is a lightly insulated jacket for cool weather activity. Designed to be worn as a standalone or mid layer, this versatile hoody adds just enough heat to a cold day and packs down small when it warms up. The synthetic insulation retains warmth even when wet, and dries quickly for the next adventure. Climbing, hiking, mountaineering, when the backcountry calls, the Atom Jacket allows you to pick up and answer.