Nines Optics Erie KBF Chad Hoover Series Sunglasses are flexible, lightweight, and durable. They utilize top-of-the-line technologies and a cool, light, and comfortable design. These sunglasses offer anglers a great, quality, stylish pair of sunglasses that are backed by pro-angler Chad Hoover of Kayak Bass Fishing. NIRTECH Polarized and NIR lenses are effective at blocking harmful rays. Each pair of sunglasses has anti-glare, anti-reflective, and hydrophobic coatings to help keep your lenses clean and give you the clearest vision possible, and are built using a TR-90 thermoplastic material in the frame.