SWEAT-WICKING BREATHABILITY. The Nike Pro Dri-FIT Tank helps keep you cool, dry and focused on your performance. Lightweight fabric is made from at least 50% recycled polyester and keeps the air flowing so you can breathe easy during high-heat workouts or competition. Built-in Comfort Lightweight, breathable fabric with Dri-FIT technology moves sweat from your skin for quicker evaporation to help you stay cool, dry and comfortable. Flexible Coverage Hem vents let you move freely through your workout, while a longer back has you covered as you bend and sprint.