If you're trying to keep up with the competition, you need to keep up with changing light. Oakley engineered Half Jacket 2.0 to let you swap out the lenses with ease. Features: Lightweight O Matter™ frame material with ellipse metal icon accents Unobtainium™ earsocks and nosepads for increased comfort and performance 8.75 base lens geometry with HDO™ Lens Technology: Prizm™ is a revolution in lens optics built on decades of color science research. Prizm™ lenses provide unprecedented control of l