Base Curve: 6.25. Acetate: Acetate is hypoallergenic, lightweight, and can come in many different colours. SWITCHLOCK™: To make the process of lens changing fast, easy and hassle-free, this technology uses a simple switch mechanism to release the mounted lens so a new one can be locked in instantly. It lets athletes adapt their vision and keep up with changing light. HIGH DEFINITION OPTICS®: High 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. UNOBTAINIUM®: A soft hydrophilic synthetic, it increases adhesion when wet to grip better when you perspire. This makes it ideal for earsocks and nose pads in performance eyewear. PRIZM™ ROAD: A revolutionary lens technology that fine-tunes vision for specific sports and environments. Prizm Road lenses enhance the road so you can see obstacles like rocks and potholes quickly and feel more confident as you ride.