Take on your route with the Nike Dri-FIT Miler Tank. It has lightweight performance and mobility for the entry-level runner. This product is made from at least 50% recycled polyester fabric. Ventilated Flow An all-new fabric made from crimped yarn creates airflow to help keep you cool. Its soft feel helps cuts down on chafing during runs. Keep It Moving The seams at the shoulders are rolled back to help your arms move freely. A slightly curved hem extends the coverage at the back while side vents keep you mobile.