Where style and function finally collaborate, Signal sunglasses will help you relax in comfort at a sunny afternoon BBQ, as well as protect your eyes from the dirt when you're riding the canal cycle path to work in the morning. Featuring performance oriented polycarbonate lenses, you get great optical clarity along with full UVA and UVB protection Polycarbonate Lenses: Optics from Madison meets the highest standard for eyewear; ISO 12312. The interchangeable polycarbonate lenses are both impact and scratch-resistant. The lenses offer both supreme optical clarity and UV-A and UV-B protection. Multi-Purpose: Both versatile and stylish, Madison Optics maintain their good looks on the road or trails. TR-90 Frames: TR-90 plastics are lightweight, flexible and durable. TR-90 plastic memory allows them to flex and return to their original shape without breaking or bending. Secure Fit: Our frames work seamlessly with your helmet with non-slip rubber tips for maximum comfort and security. The f...