Atom Series: Insulated mid layers made with hydrophobic synthetic material that resists absorbing moisture. Outer fabric has a water repellent finish. LT: Built with highly durable top performance materials but designed with a streamlined minimalist set of features to provide very light weight. This trim hybrid hoody is designed as an active use insulation layer, providing vital core warmth with liberal mobility and breathability. Lightweight and compressible, the Atom LT Hoody features CoreloftTM insulation in the torso, arms and hood. The side panels and underarms feature PolartecR Power StretchR with HardfaceR Technology, delivering stretch mobility and breathability. A wind and moisture resistant outer shell extends stand alone usability. Features: Moisture resistant outer face fabric Breathable Insulated Lightweight Compressible and packable Wind resistant DWR finish Durable Water Repellent helps repel water from fabric surface Composite construction Breathable, stretch side panels for enhanced comfort and mobility Articulated elbows Gusseted underarms Trim fit for base layer or light mid layer use Insulated, helmet compatible StormHoodTM ScubaHoodTM Full front zip with wind flap Stretch knit cuffs Adjustable hem drawcord Drop back hem Laminated hem Internal chest pocket Two hand pockets Trim Fit, Hip Length Weight: 330 g 11.6 oz Activity: SkiSnowboard Ice Climbing Alpine Climbing Hiking Trekking Materials: PolartecR Power StretchR with HardfaceR Technology 88% polyester, 12% elastane, 230 gm . A four way stretch fabric that allows for excellent athletic movement and good breathability to maintain comfort. Some products feature HardfaceR Technology for a higher level of abrasion resistance. 60 gm CoreloftTM insulation TinthanTM 100% nylon 1.9 ozyd , 46gm . 20D mechanical stretch nylon rip stop with an air permeable polyurethane coating DWR finish. This lightweight stretch fabric has good abrasion resistance for its weight.