This Nike Dry women's running tank top is perfect for warm-weather running, with ultralight, ultra-breathable fabric that won't weigh you down, no matter how hot it gets. The Dri-FIT/STAY COOL fabric wicks away sweat to help keep you cool, dry and comfortable. Made out of 100% polyester.Features a strappy racerback design with a large keyhole design for full range of motion. Also features a scoop neck for a non-restrictive fit. The longer hem offers extra coverage as you run. Reflective.