Arc'teryx Atom AR Jacket Men's Tyono - 100% Nylon Imported ATOM AR JACKET - Significantly warmer and more protective than a fleece jacket, this insulated jacket is breathable enough to be used as a super warm mid-layer on frigid days and protective enough to be an outer layer while belaying or hanging out at camp. ALL ROUND - High performance weather protection and materials, emphasizing versatility for multiple activities. ARC'TERYX ESSENTIALS - Versatile high performance designs for diverse activities and conditions. ATOM - Versatile synthetic insulated mid layers with a high degree of weather resistance. SYNTHETIC INSULATION - Man-made insulation with quick dry times, durability and retains warmth when damp.