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When it comes to sunny days out on the water, the Costa Mainsail 580G Sunglasses always make for smooth sailing. These polarized shades boast 580G LightWAVE glass, one of the industry's clearest, to filter out the harsh glare of light reflecting off the water's surface while enhancing colors and details. Plus, the tough nylon frame and grippy Hydrolite nose pads help us stay the course through rough, choppy seas.