Product Information Insulated, mid layer jacket with wind and moisture resistant outer face fabric; ideal as a layering piece for cold weather activities. Atom Series: Synthetic insulated mid layers | LT: Lightweight. Product Features High performance, minimalist design that is durable for its weight. Man-made insulation with quick dry times, durability and retains warmth when damp. Versatile high performance designs for diverse activities and conditions. Versatile synthetic insulated mid layers with a high degree of weather resistance.