Arc'teryx PRO Atom LT Jacket Gen 2.1 | Lightweight Tactical Insulated Jacket Mission Ready Warmth. Zero Compromise. The Arc'teryx PRO Atom LT Jacket Gen 2.1 is a lightweight insulated tactical mid layer designed for professionals operating in unpredictable environments. Originally developed for Special Reconnaissance tasks, this versatile jacket can be worn as a standalone outer layer or paired with a wet weather shell when conditions demand additional protection. Balancing warmth, breathability, and mobility, the Atom LT Gen 2.1 delivers reliable insulation without the bulk of traditional cold weather gear. CLIMASHIELD Combat Fibrefill insulation traps warmth while maintaining excellent breathability during high-output movement. The durable outer shell combines Toray mechanical stretch mini ripstop and high air permeability nylon ripstop fabrics, creating a jacket that is both rugged and comfortable under armor, packs, or load-bearing equipment. Polartec Power Stretch Hardface side panels increase ventilation and flexibility, allowing the jacket to move with you during dynamic operations while managing heat and moisture efficiently. Operational upgrades in this generation include snag resistant vertically routed drawcords and integrated communications cable routing loops, allowing cables to exit cleanly from the media ports inside the hand pockets. These subtle details make a significant difference when running radios or other communication equipment in the field. If you are searching for an Arc'teryx PRO insulated jacket, tactical mid layer jacket, military cold weather jacket, or breathable field insulation layer, the Atom LT Gen 2.1 remains one of the most trusted professional insulation layers available. Why We Love the Arc'teryx PRO Atom LT Jacket Gen 2.1: The Atom LT has long been one of the most versatile insulation pieces in professional gear. The Gen 2.1 version keeps everything that made it trusted while refining small details that matter in operational environments. It provides lightweight warmth, excellent mobility, and clean cable management while maintaining a low profile that layers easily with other mission gear. Key Features of the Arc'teryx PRO Atom LT Jacket Gen 2.1: Lightweight tactical insulated mid layer designed for reconnaissance and field operations CLIMASHIELD 2 oz Combat Fibrefill insulation for breathable warmth Durable Toray mechanical stretch mini ripstop outer fabric High air permeability nylon ripstop construction Polartec Power Stretch Hardface side panels for ventilation and mobility Durable Water Repellent finish for light weather resistance Designed for standalone use or layering under a wet weather shell Pocket Configuration Zippered left chest pocket for secure storage of mission essentials Two hand pockets with integrated media ports for cable routing Cable management loops for routing communications cables Hem Configuration Adjustable drawcord hem closure Vertically routed drawcord with enclosure to reduce snagging Zipper Configuration Full front zip closure No Slip Zip front zipper prevents accidental opening at the collar Sustainability Contains materials that meet bluesign criteria Lining uses bluesign approved materials with recycled content PFAS compliant construction Materials Toray Mechanical Stretch Mini Rip Lightweight fabric Li Peng High Air Perm Nylon Ripstop CLIMASHIELD 2 oz Combat Fibrefill insulation with DWR Polartec Power Stretch Hardface Jersey Velour (223 gsm / 6.6 oz) Fabric origin: Japan, Taiwan, ChinaDyeing origin: Japan, Taiwan, ChinaManufactured in Bangladesh Note: Washing may release plastic microfibres into the environment. Specifications Weight: 405 g / 14.3 oz Model: X000006850 Available sizes: XS, S, M, L, XL, XXL Care Instructions Machine wash gentle cycle low Tumble dry gentle low Do not bleach Wash dark colors separately Do not dry clean Do not iron Do not use fabric softener Double rinse recommended Do not wring Size + Fit
