Never go to battle in the cycling trenches without your precious Oakley Flak Jacket XLJ glasses. The frames use Oakley's lightweight O-Matter material and feature a semi-rimless design for an extensive field of view. Their Plutonite lenses filter 100% of all UV rays, meet the highest impact protection standards and the XLJ designation means the lenses offer more coverage for larger faces. Plus, the ear and nose pieces are made of Oakley's Unobtainium to keep your glasses exactly where you want them, and two nose pieces are included with every frame for a perfect fit.
When Transitions lenses are exposed to UV light, trillions of photochromic molecules in the lens begin to change structure. This reaction is what causes the lenses to darken. Transitions lenses help increase visual contrast, and because light conditions often change during a ride, these lenses improve depth perception so you see everything in your path.
Oakley's proprietary Iridium lens coating reduces glare, increases contrast and balances light to help you see better.