Light, packable and proven, the Atom an Arcteryx icon is a performance warming layer for backcountry adventures, alpine ascents and downtown commutes. Refined for its next generation, Arcteryx elevated its performance and extended its versatility. The Coreloft Compact 60 insulation retains heat when wet and withstands repeated packing and unpacking. The soft, durable Tyono 20 face fabric resists wind and weather, and stretch fleece side panels improve ventilation and freedom of movement.