The Flak 2.0 S (OO9511) by Oakley is a performance-driven sport sunglass designed with smaller face sizes in mind. It features a lightweight O-Matter™ frame that stays sturdy yet comfortable all day. With no-slip Unobtainium® nosepads and earsocks, the fit stays secure even as you sweat or move fast. The lens uses Prizm™ technology to enhance color and contrast, letting you pick up more detail when conditions are bright or changing.