Electric Knoxville Sport XL JJF Our bestselling Knoxville has been given a sport upgrade. Feather weight construction with performance grip nose bridge and temple tips. Signature model by John John Florence, one of the world's leading surfers. Frame: - Lightweight and flexible, our featherweight Grilamid® injected frames are impact resistant and maintain high flexibility. Our Sport Line features dual-action hinges, sunglass leash holes, featherweight construction, flexible impact-resistant frames and non-slip nose pads. Grey Polarized lens: - Optimal lens for daily use in bright conditions. Provides increased clarity and depth perception while providing visual comfort. Featured in all of our sunglasses, melanin (which gives the lens a slight green tint) blocks 98% HEV blue light, provides crisp vision and a heightened level of defense, all while delivering 100% UVA/UVB protection. The Grey Polarized lens block 99.9% of debilitating glare from the water's surface. Cutting through the glare of the water’s surface while providing superior color contrast, you'll see your best with polarized. Polarized lenses provide crisp vision, reduced eye fatigue and all-around healthier eyes. - 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: 10%