The Wiley X KNIFE style is a sleek and streamline model featuring the patented removable facial cavity seal technology. At the same time, their stylish looks and versatility make these new shades perfect companions for fishing, boating, motorcycle riding or just relaxing around town. The impressive design guarantees you a pair of cool looking sunglasses. At leisure or at work you will feel safe and comfy. This is really a stylish eyewear and still functional, without being a distraction. KNIFE prescription sunglasses give you the evident opportunity to design a tailor-made pair of transition prescription sunglasses or any other prescription lenses of your choice - Of course containing all the protective features Wiley X is known for The Smoke Grey lens provides maximum glare reduction. Won?t distort colors and the function is excellent in bright and glare conditions. Light transmission: 15%.