The Arc'teryx Atom Hoody is the ultimate "everything" jacket, designed to solve the dilemma of what to wear for high-output activities in unpredictable weather. Whether used as a standalone layer for a crisp morning hike or a mid-layer for winter touring, the Atom delivers consistent warmth without the bulk. Its Coreloft Compact insulation is engineered to retain heat even when damp, making it a more resilient and versatile alternative to traditional down for year-round mountain use.