FCROCKBROS Cycling Glasses Photochromic MTB Road Bike Glasses UV400 Protection Sunglasses Ultra-light Sport Safe Eyewear Equipment

ROCK BROS Photochromic Sunglasses Intelligent, Photochromic Clear Transparent Ultralight Rimless UV400 Protection Great for Golf, Cycling, Driving, Skiing, Runing, Tennis, Racing and Other Outdoor SportsTransmittance: 80%-18% (80% is light gray color when in low UV, 18% is dark gray color when in high UV)Product Features:1.Photochromic Technology2.Frameless Construction,Wide Vision3.Lightweight cycling sunglasses4.Thicken PC lenses with UV400 protection coating5.Adjustable soft rubber nose6.ROCK BROS sunglasses can be used for multiple activitiesWarning:Color changing time differs from intensity of sunlight.Winter for about 3 minutes , summer for about 2 minutes