Oakley Flak 2.0 XL Sunglasses is taken from there Performance collection from Oakley with a standard size frame which features an enhanced lens coverage with a deeper lens on the semi-rimless frame which is given even more grip than previous incarnations with the stems as well as the nose pads fully covered with unobtanium that grips more with perspiration. The Prizm Road lens is specifically designed to enhance your view so you can see obstacles such as rocks and ruts easily.