NIKE PREMIER RF Roger Federer FEATHERLIGHT 2013 US Open Dri-FIT fabric helps keep you dry and comfortable Mesh panels and interior perforated panel provide optimal breathability Hook-and-loop back closure with reflective pull tab offers a personalized fit and greater visibility Fabric: Body/bill: Dri-FIT 100% polyester. Sweatband: Dri-FIT 91% recycled polyester/9% spandex. Black underbill reduces glare