The Atom LT Vest is versatile as both a midlayer or a standalone, but it is also a proven performer across a range of seasons, landscapes and activities. Coreloft™ Compact synthetic insulation retains warmth if wet and withstands years of packing and unpacking, and the breathable, durable Tyono™ 20 shell resists wind and light weather. Stretch fleece side panels aid ventilation and freedom, and the entire vest packs into its own pocket. Take this trim fit vest to the slopes or for a walk.