Light, packable and proven, the men's Atom Jacket-an Arc'teryx icon-is a performance warming layer for backcountry adventures, alpine ascents and downtown commutes. Refined for its next generation, Arc'teryx 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.