Designed to provide maximum comfort and flexibility for running, the 2XU Women's Light Speed 1/2 Zip is made from lightweight, quick drying and moisture-wicking fabric to pull sweat away from your skin. The mesh panels across the back enhance breathability. The 1/2 zip allows you to adjust your exposure to the temperature and the thumbholes on the sleeve cuffs provide added warmth and comfort on those cooler runs. The reflective logos enhance visibility in low-light conditions.