Enjoy optimal visibility in these Oakley Flak Beta Sunglasses. Oakley have added the Flak Beta to their impressive Flak collection. The interchangeable lens design means that you can benefit from the fantastic Oakley lens technology in a variety of activities. The Prizm Road Lens is revolutionary in lens optics. Prizm lenses provide great control of light transmission. Colours are precisely tuned to maximise contrast & enhance visibility on the road.