BZ Optics have done something unique in the cycling world placing high impact UV activated photochromic lenses in their sporty Pho frames. The Hi Definition Copper coloured lens will change from Cat1 pre dawn or low light to dark Cat3 as the sun intensifies and the UV increases. The super light-weight frame has dual moulded non—slip flexible temples ideal for wearing while riding. Adjustable for all faces you can get more out of your riding.