The K3s Classic are an homage to the most authentic sports, for which effort, courage and fellowship are above anything else. Lighter than ever, their 26 gram PC frame along with their interchangeable polarized Special TAC 1.2 photochromic lens offer any athlete the greatest performance. All styles in the K3s PhotoChromic collection count on our DrySky ventilation system to guarantee excellent vision in any situation. This product includes PU hardshell case, microfiber pouch and replacement rubber bands for temples and nose pad. Available K3s accessories: TR90 optical clip, anti-fog lens and clear lens. Our photochromic lens is sensitive to distinct changes of light by adapting to each moment in an extremely efficient way. Ideal for cloudy and clear days, and also for environments in which sunny and shadowy areas alternate. The K3s PhotoChromic lens controls the transmission of light independently, going from category 2 (42% VLT) to category 3 (11% VLT) in less than sixty seconds, optimizing contrast and favoring visibility.