The Kyanite Baselayers are made for cold days and mixed output. On the move, the Polartec Power Stretch Pro stretches for outstanding freedom of movement. During rest phases - or when it gets really cold - the fleece’s soft brushed interior traps heat to keep you warm. The fleece’s durable nylon outer has a smooth face for comfort under layers, the tall collar extends warmth, and the deep front zipper aids heat dump and makes on-and-off easier. Updated with a new fabric made with recycled content. Arc'teryx Womens Kyanite Baselayer Zip Neck Features: Suitable for Alpine,Freeride,Hike,Mountain Run,Resort,Touring Moisture-wicking,Durable,Versatile Polartec Power Stretch Pro combines a highly durable nylon face with a soft, comfortable, brushed polyester interior Trim fit makes it an ideal layering piece Articulated patterning for unrestricted mobility Tall collar Sleeve pocket with zip Deep front zipper for easy on and off, rapid ventilation Contains materials that meet the bluesign criteria,Biocidal Disclosure - This model was treated with an anti-odour biocidal product (Active Ingredient: Silver Nitrate),PFAS (Per- and polyfluoroalkyl substances) Compliant