Designed for optimal movement and warmth, the 2XU Light Speed 1/2 Zip is ready for your cool-weather runs. Made with 3 lightweight fabrics keep you dry, cool, and has ability for maximum flexibility. The quick-drying main fabric is moisture-wicking while the back mesh panel allows for airflow, and the ribbed raglan sleeves provide movement proficiency. The 1/2 zip allows for easy on and off plus heat regulation as you run, and the stand collar and thumbholes give you a little extra coverage to help keep you warm when the temperature drops.