Julbo Trail Performance Sunglasses, Zebra Light Lens, Black ZEBRA Lenses: The Zebra photochromic lens darkens or lightens depending on the lights intensity. It can change from a light transmission rate of 40.7% to just 6.6%! Coverage: Wide lenses and curved frames for maximum visibility. Helmet-friendly: fits comfortably under any helmet. Hold and positioning: shock absorbent temples and nose pads that can handle the technicalities of any trail. Vario Venting: Adjustable ventilation to adapt to various conditions and/or sports. Zebra is recommended for mountain biking, trail biking and climbing. Flex Nose: Adjustable nose piece for perfect fit, adherent material for optimal hold in all situations. Its anti-fog coating, directly integrated via laser, guarantees maximum efficiency and long life. Optical clip: Ideal for those who require optical correction and do not wish to wear contact lenses, can be removed if necessary.