Arc'teryx Atom LT Vest - Women's: Lightweight, insulated Coreloft(TM) vest, designed to preserve core warmth; ideal as a layering piece for cold weather activities. Atom Series: Synthetic insulated mid layers | LT: Lightweight. This sleeveless core-heater hugs the body with efficient Coreloft(TM) insulation to preserve warmth while durable fleece side panels-made with PolartecA(R) Power StretchA(R) with HardfaceA(R) Technology-increase active use breathability and mobility. A wind and moisture resistant outer shell extends stand-alone usability. Coreloft Fibres CORELOFT(TM) INSULATION Developed by Arc'teryx, Coreloft(TM) is a synthetic insulation made of staple fibres in mixed sizes that are crimped to trap air and retain warmth. Available in different thicknesses for end-use performance and comfort. Lightweight and highly compressible Durable and resilient Retains its warmth in humid and wet conditions and dries quickly if wet Atom Insulated mid layers made with hydrophobic synthetic material that resists absorbing moisture. Outer fabric has a water-repellent finish. LT | Light Weight Built with highly durable top performance materials but designed with a streamlined minimalist set of features to provide very light weight. Technical Features: Moisture-wicking Breathable Insulated Lightweight Compressible and packable Wind resistant Construction DWR finish (Durable Water Repellent) helps repel water from fabric surface Composite construction Breathable, stretch side panels for enhanced comfort and mobility Patterning Trim fit for base layer or light mid-layer use Collar Configuration Soft brushed-lined collar Mid-height collar Zippers & Fly Configuration Full front zip with wind flap Hem Configuration Drop back hem Pocket Configuration Internal chest pocket Two hand pockets