Siroko's K3 MTB model meet the needs of the most demanding cyclists. Special TAC 1.2 mm interchangeable panoramic lens, polarized with anti-fog film and REVO cover. DrySky anti-fog system. Extremely flexible and resistant polycarbonate frame. Maximum lightness: they weigh only 27 grams! Includes polyester bag, polyurethane case and spare bands for nose piece and arms. Accessories: photochromic lens, TR90 optical clip, anti-fog lens and clear lens (sold separately).