ROCKBROS Unisex Photochromic Cycling Sunglasses UV Protection for Outdoor Sport Black Blue

CONVENIENCE: Intelligence lenses changing from light to dark based on the UV intensity. Lighter the outside,darker the lenses. Do not need to interchange lenses for different light conditions LIGHTWEIGHT: This photochromic sunglasses only weight 29 grams. PC made lenses and frame process durable RockBros photochromic cycling glasses. Wide use for outdoor activities such as cycling, running, hiking ,climbing ,skiing ,fishing ,driving. SOFT rubber nose bridge can adjusting to your expected angle maximum personalized outfit Clarity vision: Transmittance from 80% to 18% (80% is light gray color when in low UV, 18% is dark gray color when in high UV)