The Atom LT is a synthetically insulated jacket designed to keep you warm and dry. This jacket is streamlined with only essential features included to ensure low weight and maximum functionality. At only 360 grams, this jacket isn’t going to weigh you down. If your looking to buy an insulating jacket it needs to be as versatile as possible. The Atom LT will perform across a variety of climbs and weather conditions, keeping you warm and dry. The perfect combination really! Arc'teryx Atom LT Hoody 2017 | Tech Spec Review