The K3 Road Race are the perfect match for difficult sports environments. Optimized performance provided by their ultra-lightweight PC frame of only 27 grams and their interchangeable polarized Special TAC 1.2 photochromic lens. All styles in the K3 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 K3 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 K3 PhotoChromic lens controls the transmission of light independently, going from category 1 (45% VLT) to category 3 (11% VLT) in less than sixty seconds, optimizing contrast and favoring visibility. The percentages may vary slightly.Technology:Special Tac 1.2 Lens:- Takes Care Of Your VisionPolarized Lenses:- No Eye FatigueUltra-lightweight:- Only 27grPanoramic Vision:- Don´t Miss Any DetailAnti-fog:- Drysky+ SystemAnti-slip Bands:- Perfect FitInterchangeable Lenses:- Adapt To Your EnvironmentOptical Clip:- Siroko 20/20 VisionK3 Technology:- The avant-garde of sports optics technology. The Siroko Special TAC 1.2 lenses offer you a clear panoramic vision without distortions. They´ll be your best option both for casual training sessions, hiking and even competitions. Designed to maximize the visual field, minimize the impact of reflections, solar radiation, adverse weather conditions, humidity and sweat. The combination of different layers throughout its manufacturing process adds full protection against damp, reflections and UV400 radiation.Care:- Don't leave the glasses exposed in areas with intense heat.- Protect the lenses properly by using the included case and pouch.- To clean the lenses, use the included cloth pouch. Use water beforehand if there are remnants of dust, sand or mud stuck on the lenses.