Perfect for chilly runs, the Nike Dri-FIT Element Men's Long Sleeve Half-Zip Running Top helps keep you warm without overheating. The standard fit follows the shape of your body with added room for comfort. Keep Cool, Stay Warm Throughout the back is a more open knit for breathability, helping to keep the fabric from clinging to your skin. A half-zip design lets you adjust for the right amount of ventilation, while allowing you to keep covered when you transition to post-run plans. Move Freely Thumbholes keep the sleeves from shifting or flapping in the wind, and add a little more coverage in cool weather. Raglan sleeves and seams that follow the shape of your arm allow you to move naturally. Stay Dry The soft fabric features Dri-FIT Technology that wicks sweat away from your skin to the fabric's surface where it quickly evaporates. More Details Flat seams feel smooth on your skin Reflective elements help you stand out Fabric: Body: Dri-FIT 88% polyester/12% spandex. Mesh: 89% polyester, 11% spandex