The nike miler uv is running top is an ultra lightweight running top with strategic ventilation and flat seam construction to help you perform at your peak. uv resistant properties and full length sleeves help protect your skin from harmful uv rays and the nike considered design produces a high performance product with a low environmental impact. mesh panels enhance ventilation to keep you cool while a reflective cord management loop prevents your headphone cords getting in the way of your run. fabric: 100% dri-fit uv recycled polyester dri-fit uv fabric to help keep you dry and comfortable while helping to protect against uv rays. mesh crew neck for a comfortable, breathable fit- flat-seam construction eliminates chafing. a longer back hem helps keep your shirt in place. a reflective cord management loop on the upper back means you can run without your headphone cords getting in the way. reinforced nike running tape around the neck adds durability and enhances comfort. considered design delivers high performance with a low environmental impact. uv resistant properties and long sleeves protect your skin from harmful uv rays.