🕶 PHOTOCHROMIC TECHNOLOGY: Photochromic lenses darken and lighten as the outdoor light changes without needing to switch between glasses , the color of photochromic sunglasses will change from clear to grey in sunny , Effectively protect your eyes and maintain a comfortable light.Comfort and performance that holds lenses in precise optical alignment. 🕶 UV400 PROTECTIVE LENSES: The PC lens of sports sunglasses is Anti-UV, with UV400 protection coating, Since the light with wavelength below 400 nanometer are the ultra violet light range which is harmful for the eyes, this sunglasses will provide people the 100% UV protection to protect your eyes perfectly. 🕶 STYLISH & DURABLE & Multi-PURPOSE: ROCK BROS mens sunglasses made with blue half frame , fashion and stylish design , engineered to be the multi-sport sunglass like cycling ,running, driving,fishing, golf , baseball ,motorcycle ,walking ,racing, climbing, hiking or other outdoor activities . lighter performance frame and features lens in a wider design for an unobstructed view. 🕶 LIGHTWEIGHT & COMFORTABLE: The uv protective goggles only 27g . ultralight cycling sunglasses reduce the pressure while outdoor activties. Solid 3-point support with slip-resistant rubber nose pad and frame leg , fit your face better . Polycarbonate lens and frame are impact resistant, scratch resistant,flexible, durable and unbreakable. 30-Day Return Policy: All ROCKBROS customers are covered by our 30-day return policy. If you’re not completely satisfied with your sports sunglasses, simply reach out to us within 30 days for a hassle-free return. Shop with confidence and peace of mind!