The Siroko K3 Triathlon have passed the most demanding quality tests and are at the forefront of sports optics. Special TAC 1.2 mm interchangeable panoramic polarized lens with anti-fog film and REVO cover. Ultra-light (only weighs 27 grams!) PC frame. Reinforced DrySky anti-fog system. Includes polyurethane case, microfiber bag and spare rubber bands for nose and arms as a free gift. Photochromic lens, TR90 optical clip, anti-fog lens and clear lens also available as accessories.