URBAN frame with High Definition Photochromic LensThis High Definition Copper coloured lens will change from Cat1 pre-dawn or low light to dark Cat3 as the sun intensifies and the UV increases.Category 1 â Light tint, with light transmission at 43% to 80% - For cloudy days.Category 2 â Medium tint, with light transmission at 18% to 43% - Good for all but the sunniest days.Category 3 â Dark tint, with light transmission at 8% to 18% - For very sunny days.Frame options include crystal clear, gloss coke (brown) and matt black.The frame had a moulded, built-in nose piece.All pairs are supplied with a case and micro fibre cleaning cloth.