Designed for mountain biking and outdoor racing enthusiasts with photochromic lenses, the snug fit of Julbo's Dust Sunglasses is ensured with grip nose and grip tech temples, while the slim, flexible frame can be slipped comfortably under a hat or helmet.This product will be shipped directly from Julbo and will leave their warehouse in 2 3 business days. Eligible for UPS ground shipping only. . Fits medium profiles with a wide field of vision and excellent venting. Zebra photochromic lenses darken or lighten depending on light intensity VLT changes from 42% to 7% with activation from 22 28 sec.. VLT Visible Light Transmission: percentage of available light allowed to reach the eye the lower the number, the darker the lens. Category 2 protection in the undergrowth category 4 protection in bright sunlight. 100% protection from UVABC rays. Brown lens tint accentuates relief antifog coating prevents condensation. Panoramic shape with a wide lens surface for broad vision spectrum. Curved wrapping temples shaped and cut to provide better hold with sharp and repeated movements. Grip nose supple, shock absorbent insert adheres to the nose. Grip Tech inserts at stem ends for comfort and hold do not stick to hair. Full venting allows complete air circulation to avoid fog. Fit eye, bridge, temple: 66, 17, 120 mm. Protective case included.