Julbo Instinct Sunglasses 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%! Wrap Around Coverage: Curved frame with wide temples to protect against harsh sunlight. Total-wrap geometry lenses for an extra-wide field of vision Grip Tech: Inserts at stem ends for comfort and hold, does not stick to hair Curved temples: Ergonomic profile to wear sunglasses on face or head. Zebra is recommended for mountain biking, trail biking and climbing. Its anti-fog coating, directly integrated via laser, guarantees maximum efficiency and long life.