timeless design with italian quality standards. the knoxville by electric is a modern classic. elegant lines, a lightweight grilamid frame and a comfortable fit ensure comfort and style.grey lenses with 6 base melanin-injected polycarbonate lenses, you'll get the best possible protection for your eyes from harmful uv rays. electric exclusively uses a makrolon® material made from raw polycarbonate. these lenses are lightweight, offer excellent visual clarity and are impact resistant.