Always ready to hit the flats or hook a deep-sea behemoth, Costa Del Mar Fantail 580G Glass Polarized Sunglasses are the little brother to another fisherman's favorite, the Costa Blackfin. Fantail sunglasses boast 580G LightWAVE glass lensesthe clearest in the industry. They are also scratch-resistant and thinner and lighter than average polarized glass. 580 technology goes beyond polarization to produce the best lenses on the planet by selectively filtering out harsh yellow and harmful blue light, making colors brighter and objects appear more defined. Select styles also feature mirror coatings for even better glare-fighting power. These fishing sunglasses feature durable co-injected nylon frames made using an eco-friendly bio-resin process (using castor oil instead of petroleum) to reduce emissions and overall carbon footprint. Costa Fantail sunglasses sport Hydrolite nose pads and temple tip inserts for a more secure, comfortable fit. They also include a case, a cleaning cloth, and a mfrs. 2-year limited warranty.Manufacturer style #: 580G. 580G LightWAVE glass lenses - the clearest in the industry Scratch- and impact-resistant lenses Polarized to kill glare Mirror coatings (on select styles) help control glare 100% UV protection Eco-friendly bio-resin frames with nonslip Hydrolite nose pads and temple tip inserts