Light, packable and proven, the Atom LT – an Arc’teryx icon – is a performance warming layer for backcountry adventures, alpine ascents and downtown commutes. Refined for its next generation, we 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. Weight 345g / 12.2 oz Fit Trim fit, Hip Length, Centre back length: 74 cm / 29.1 in Versatile synthetic insulated mid layers with a high degree of weather resistance. High performance, minimalist design that is durable for its weight. Versatile high performance designs for diverse activities and conditions. Man-made insulation with quick dry times, durability and retains warmth when damp.