ROCKBROS Photochromic Sunglasses Intelligent Lens, Photochromic Clear Transparent Ultralight Rimless UV400 Protection Great for Golf, Cycling, Driving, Skiing, Runing, Tennis, Racing and Other Outdoor Sports <br> Transmittance: 80%-18% (80% is light gray color when in low UV, 18% is dark gray color when in high UV) <br> <b>Warning:</b> <br> Color changing time differs from intensity of sunlight.Winter for about 3 minutes , summer for about 2 minutes <br> Brand: ROCK BROS <br> Weight: 30g/pair <br> Gender: Men,Women,Adult,Youth, Boys, Girls <br> Color: Black Red <br> Frame Type: Full Frame <br> Delicate lenses : Lenses with UV400 protection + Intelligence photochromic technology <br> <br> <b>Product Dimensions:</b> <br> Lens Size: 7.2 * 5.2cm <br> Nose bridge: 2.6cm <br> Frame length: 12.1cm <br> <br> <b>Package Included:</b> 1* Intelligence photochromic lenses glasses <br> 1* Portable pouch + 1* Glasses box <br> 1* Glasses cloth <br> 1* Myopia frame <br> <br> <b>Features:</b> 1.PHOTOCHROMIC TECHNOLOGY: Intelligent lens cycling sunglasses automatically lightens or darkens in response to changing light conditions without needing to switch between glasses <br> 2.Frameless construction giving you more clear peripheral vision to avoid the frame blocking your view <br> 3.Ultralight cycling sunglasses reduce more pressure on your nose and temples and the tendency to forget you're wearing it <br> 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 <br> 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 <br> 6.ROCKBROS photochromic sunglasses can be used for multiple activities, such as golf, cycling, dirving, fishing, skiing, runing, basketball, tennis, racing and other outdoor sports <br>