Perfect for chilly runs, the Nike Dri-FIT Women's Long-Sleeve Running Half-Zip Top keeps you warm without overheating. A looser fit under the arms and through the body lets you wear it over a tank, while its updated thumbhole design adds to your comfort. Stay Cool Throughout the upper back is a more open knit for breathability. 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. Stay Comfortable Thumbholes keep the sleeves from shifting or flapping in the wind and add a little more coverage in cool weather. 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.