Photochromic Sunglasses Color: Black frame Lens color: Clear photochromic Made of resin Photochromic lenses that change color with the amount of UV light. Changes from clear to gray. For reference, the 4th photo shows partial photochromic activation using a tester. Clear photochromic lenses are excellent lenses that can be used in various situations, from bad weather and nighttime to daytime. I don't think you'll find this specification at this price very often. Ideal for sports like road biking, as well as outdoor leisure, golf, and driving. Eyeglasses, glasses, sunglasses, progressive lenses, intermediate lenses, bifocals, reading glasses, fashion glasses, sea fishing, rock fishing, stream fishing, golf, driving, UV protection, cycling, road bike, running, jogging, walking, photochromic lenses, polarized lenses, photochromic sunglasses, polarized sunglasses, Wellington, Boston, road bike, cross bike, mountain bike MTB, cyclocross, gravel road, cycling wear, cycling jersey, cycling accessories, sportswear, 100% One Hundred, Rudy Project, clear photochromic sunglasses Uses/Features: Mountain bike, race bike, road bike, cycling jersey, other Genre: Road bike Type: Sunglasses Gender: Unisex