Electric Knoxville Polarized Sunglasses. A distinct keyhole nose bridge and streamlined styling define the legendary Knoxville. Classic design traits and a lightweight fit have made this award-winning frame a brand favorite for over a decade. Grey Polarized Lens: Visual Light Transmitted (VLT) 11%. Cat. 3. Base tint is a neutral grey color - best suited for brightest light conditions. Protects from harmful HEV light (98%) & UV (100%) while delivering eye relaxation and accurate color perception. Premium scratch resistance & impact protection lens. Melanin-infused lenses. Lightweight Bio-Resin impact-resistant frames. Imported.