Arc'teryx Men's Size Chart The Atom SL Vest offers minimalist insulation for warmer days or higher output activities. Its Tyono(TM) 20 shell is lightweight, durable and wind resistant, and the Coreloft(TM) Compact insulation is compressible, dries quickly, and allows airflow. Lightweight air-permeable fleece side panels provide ventilation and thermal performance. Composite Mapping is used to place materials and insulation types in the areas that will provide maximum benefit. Features: - Moisture-wicking - Insulated - Compressible and packable - Ultralight - Wind resistant - Breathable, stretch side panels for enhanced comfort and mobility - DWR (Durable Water Repellent) finish repels moisture - Composite Mapping Technology strategically places each fabric for most effective protection and climate management - Trim fit for base layer or light mid-layer use - Mid-height collar layers easily - No Slip Zip(TM) front zipper - Adjustable hem cord seals out drafts - Two hand pockets with zippers - Fall/Winter 2017 - Alternate images do not reflect actual color - Only available to ship within the USA