Winter warmth with serious versatility – the Atom Heavyweight Jacket is built to handle a range of adventure. Wear it as a standalone during rest phases, evenings at camp, or trips to town. Use it as a breathable midlayer in cold, wet conditions. Packable and lightweight, its Coreloft™ synthetic insulation is efficient, effective and resilient. The wind-resistant and water-repellent Tyono™ 30 shell is treated for extra durability, and air-permeable Permeair™ panels under the arms improve ventilation.