The longest version of Arc'teryx's most versatile insulated jacket, this is everything you love – and more of it. Warm, light, and breathable, the Atom Long works as a midlayer under one of our longer shells. As a standalone it’s a go-to for rest stops, nights at camp, and cold morning hikes. Lightweight 100% recycled Coreloft Compact provides insulation without bulk, the mid-thigh length extends coverage, and an insulated hood tops off the warmth.