RockBros Cycling Sunglasses, Intelligent Lens, Photochromic, Clear Transparent, Ultralight, Rimless, UV400 Protection, Great for Golf, Cycling, Driving, Skiing, Runing, Tennis, Racing and Other Outdoor Sports Transmittance: 80%-18% (80% is light gray color when in low UV, 18% is dark gray color when in high UV) Warning: Color changing time differs from intensity of sunlight.Winter for about 3 minutes , summer for about 2 minutes Brand: RockBros Weight: 24g/pair Gender: Men,Women,Adult,Youth Color: Black Red , White Red Delicate lenses : Lenses with UV400 protection + Intelligence photochromic technology Product Dimensions: Lens hight:5cm Nose bridge: 2.5cm Frame length:14.3cm Package Included: 1* Intelligence photochromic lenses glasses 1* Portable pouch + 1* Glasses box 1* Glasses cloth Features: 1.PHOTOCHROMIC TECHNOLOGY: Intelligent lens cycling sunglasses automatically lightens or darkens in response to changing light conditions without needing to switch between glasses 2.Frameless construction giving you more clear peripheral vision to avoid the frame blocking your view 3.Ultralight cycling sunglasses reduce more pressure on your nose and temples and the tendency to forget you're wearing it 4.Thicken PC lenses with UV400 protection coating, shatterproof and scratch-resistant effectively, protecting your eyes from any debris, UV rays and other harmful light 5.Adjustable soft rubber nose bridge can easy find the right angle for you and ensure the sunglasses doesn't slide off your face to upgrade your using experience 6.ROCKBROS photochromic goggles can be used for multiple activities, such as golf, cycling, dirving, fishing, skiing, runing, tennis, racing and other outdoor sports