Inspired by the form and function of nature’s beauty, it's no coincidence the Aleta sunglasses get their name from the Spanish word for "fin." Offering water-ready performance in a stylish yet functional design, Aleta uses lightweight Bio-Resin and double-injected Hydrolite for a better grip. And with micro shields and hooding, excess light stays out while fog stays down with vented nose pads. Wearing Aleta, you'll see the smooth shape and refined lines that don’t just stop at style. They’re best enjoyed when on, in and near the water. Costa's 580 lenses are designed in-house by light spectrum experts to enhance colors thanks to multi-patented technology that absorbs harmful high-energy blue light (HEV), enhances reds, blues, and greens, and filters out harsh yellow. The 580 lenses are also scratch resistant, and and 20% thinner and 22% lighter than other polarized lenses on the market. Features: Bio-Resin frame580 lenses: Scratch resistant and enhances clarity20% thinner and 22% lighter than other polarized lenses on the market Costa Aleta Wahoo Frame Sunglasses w/Blue Mirror 580G Lenses 06S9108-91080154