Costa's Tuna Alley Sunglasses are built to be ruggedly durable while still giving anglers the best chance of spotting their quarry. The tough, TR 90 nylon frames include integral steel hinges and also feature a venting system so your glasses will never fog. The lightweight, scratch-resistant lenses offer a crystal clear view and glare-reducing polarization makes sight fishing easier. With a large fit, these sunglasses can be worn all day and then placed in the protective hard case. Costa's Tuna Alley polarized sunglasses are crafted to meet the challenges of blue water fly fishing. Designed for large fit Venting system reduces fogging Hard case for storage Impact and scratch-resistant polarized lenses for sight fishing and eye protection Steel hinges for added strength Durable TR 90 nylon frame.