Performing as midlayer and standalone across a broad range of activities and output levels, the iconic Atom LT is an Arc‘teryx mainstay. Over time, we have refined the design to elevate performance, improve durability and extend its versatility. Its Coreloft™ Compact insulation retains heat when wet and withstands repeated packing and unpacking. Light, soft and durable, the Tyono™ 20 face fabric resists wind and weather, and stretch fleece side panels improve ventilation and freedom of movement. Redesign includes an update to the cuff construction for easier on/off and layering, an updated material package for enhanced durability, updated fit, and a dope dyed liner. Features 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. Fit: Trim fit, Hip Length, Centre back length: 67 cm / 26 in