The Atom SL Vest delivers minimalist warmth appropriate for higher output and milder conditions. A lightweight Tyono 20 shell delivers durability and wind resistance, and the Coreloft Compact insulation is compressible, dries quickly and allows airflow. Lightweight air-permeable fleece side panels provide ventilation with thermal performance. Composite Mapping is used to place materials and insulation in the areas that provide maximum benefit.. . . . . Moisture-wicking. Breathable. Insulated. Compressible and packable. Ultralight. Wind resistant. Breathable, stretch side panels for enhanced comfort and mobility. Composite Mapping Technology strategically places each fabric for most effective protection and climate management. Trim fit for base layer or light mid-layer use. Stand up collar. Mid-height collar layers easily. No Slip Zip front zipper. Adjustable hem cord seals out drafts. Two hand pockets with zippers. DWR (Durable Water Repellent) finish repels moisture. Tyono 20, 100% nylon. Torrent 190 with Polygiene- 84% polyester, 16% elastane - side panels. Coreloft Compact 40 insulation (40 g/m^2).. Weight: 160 g / 5.6 oz. Machine wash. Imported.