Designed to maximum comfort and flexibility on your runs, the 2XU Men'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 for those cooler runs. The reflective logos enhance visibility in low-light conditions.