Oakley Flak Jacket XLJ Sunglasses - Men's For the best clarity and protection on the planet, nothing comes close to Oakley's High Definition Optics® (HDO), built right into the Flak Jacket XLJ Sunglasses. The patented technologies are a collection of proprietary and patented lens technologies that offer the best clarity on the planet. But HDO does not stop at precision. It also includes innovations in impact resistance that meet uncompromising standards of protection. These glasses provide 100% filtering of all UV light, safeguarding the eyes while ensuring the brain gets the most accurate visual information. Holding these lenses is the lightweight O Matter® frame material with ellipse metal icon accents. Unobtainium® earsocks and nosepads increase comfort and performance. This pair includes Hydrophobic™ lens cleaner that repels moisture and oils for ease of cleaning. Interchangeable lens system. Protective soft vault included.