Arc'teryx have designed the Atom Hoody as a mid layer for the winter and an outer insulating layer in warmer conditions. The slim fit eliminates bulk and fits comfortably over a base layer. Coreloft™ Compact insulation stays warm even when wet, and keeps its loft over years of packing and unpacking. It's covered with soft, breathable and durable Tyono™ face fabric, with an FC0 DWR treatment for windproof and water resistant protection. Stretch side panels improve ventilation and give you more freedom to move, and the insulated StormHood™ adds warmth. Atom Hoody - Women's