Non-Arcteryx Logo on Front in photos If you want the warmth of an Atom Hoody with a wider range of motion and smaller footprint, you're in the right place. Pull on the Atom Vest when you feel the temperature dropping on longer hikes and climbs or wear it as a midlayer under a shell for touring and wet winter objectives. The Coreloft synthetic insulation stays warm even if you run into light weather, making it a better alternative to down for high-output days year round. • Moisture-resistant outer face fabric • Breathable • Lightweight • Insulated • Packable Construction • Performance stretch fleece side panels give ventilation • Resilient Coreloft™ Compact 60 insulation is breathable, warm, and light, performs if wet, and delivers loft retention that resists packing out • Light, soft Tyono™™ 20 is air permeable • Hybrid Mapping technology puts specific fabrics where they are most effective • Breathable 20D recycled nylon liner helps regulate temperature and is soft and comfortable next to the skin