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The XL lens shape takes performance even further with an enhanced vertical dimension. Even when your head is subtly tilted downward things that matter will still be in your field of view. That makes it a great choice for activities like cycling. The slightly taller design also enhances performance in sports and activities where things above need careful attention. High Definition OpticsHigh Definition Optics HDO is a collection of patented technologies that allow Oakley eyewear to meet or exceed the testing standards of the American National Standards Institute for optical clarity visual fidelity and impact resistance. PrizmPrizm is a revolution in lens optics built on decades of color science research. Prizm lenses provide unprecedented control of light transmission resulting in colors precisely tuned to maximize contrast and enhance visibility.