Take your running routine off the main road in the lightweight Nike Dri-FIT Tank. We used trail running insights to place ventilated fabric in key areas, keeping you cool on both short off-road jogs and long mountain runs.l Dri-FIT technology moves sweat from your skin for quicker evaporation—helping you stay dry, comfortable and focused. Open-hole fabric uses data from hundreds of runners. It's placed in high-heat zones to help keep you cool on your run. More Benefits Nike Breathe fabric helps you stay dry and cool. Product Details Reflective elementss Body: 80% polyester/20% spandex. Panel: 100% polyester. Inset: 92% polyester/8% spandex. Machine wash