The Dart Zip Neck is a classic technical base layer for year-round use in any terrain. The APEX ECO fabric made from 100% recycled material offers a perfect balance of warmth, moisture management, and breathability, and is treated with the permanent odor control POLYGIENE® to stay fresh for several days. Made from lightweight, moisture-wicking, and soft APEX ECO fabric from 100% recycled polyester, it features a piqué back for optimal moisture regulation. Treated with permanent odor control POLYGIENE®, it is ideal for multi-day use. The Montane semi-automatic zipper features a reverse YKK coil in a ¼ length with an inner zipper guard. The lightweight fabric is highly breathable, making it perfect for versatile and fast-paced activities. 100% APEX ECO 100% recycled polyester with mechanical stretch. Flat seams inside and outside the fabric reduce friction and enhance the durability of the base layer, with a low collar.