Base camp of layering. Streamlined base layer with H2X-DRY® moisture management technology that wicks moisture away from the skin. The Base Thermal 1/4 Zip features a grid back fleece which offers superior thermal properties, while allowing for excellent airflow and breathability. Snag Resistant Fabric. Contour Side Panels. Reverse Coil Front 1/4 Zipper. Contrast Cover Stitching.