Electric Knoxville XL More coverage and a larger look while maintaining clean, classic lines and uncompromised fit. Frame: - Lightweight and flexible, our featherweight Grilamid® injected frames are impact resistant and maintain high flexibility. Bronze Polarized lens: - This highly versatile lens performs great in both bright and lower light settings. Provides increased clarity and depth perception while providing visual comfort. Featured in all of our sunglasses, melanin blocks 98% HEV blue light, provides crisp vision and a heightened level of defense, all while delivering 100% UVA/UVB protection. The Bronze Polarized lens block 99.9% of debilitating glare from the water's surface. HEV blue light is reduced by 98% plus you get 100% UV protection, superior color contrast haze-free vision, and reduced eye fatigue. - Lens material: All of our Grilamid frames use Bayer Makrolon® raw Polycarbonate material for our lenses. These lenses are lightweight and impact resistant. - Hard coating: A double-sided coating that reduces minor scratching. Offered as a standard treatment on all lenses. - VLT: 11%