Nike reintroduces Roger Federer's RF cap in the ultra-cool Black/Challenge Red and White/Challenge Red US Open colorways. Features Dri-FIT 58% cotton/42% polyester fabrication to keep you cool and adds function to the fashion. Dri-FIT sweatband inside cap and adjustable velcro closure at rear. Fully embroidered RF logo at front and embroidered Nike Swoosh at left of cap.