The Arc'teryx Men's Atom LT Insulated Vest is a proven performer across a range of seasons, landscapes and activities. This vest is elevated with advanced insulation and material technologies, this versatile vest delivers its best, most versatile performance ever. Coreloft™ Compact synthetic insulation retains warmth even if wet and withstands years of packing and unpacking making this vest perfect for travelling. You'll also love the breathable, durable Tyono™ 20 shell, that resists wind and light weather, stretch fleece side panels aid ventilation and freedom, and the entire vest packs into its own pocket. Additionally, this vest comes with two hand pockets with hidden zippers for a sleek look, an internal security pocket, and an adjustable hem that you can tailor to fit your needs. The Arc'teryx Men's Atom LT Insulated Vest is warm, breathable, and ready to take on any element the weather throws at it.