Named after the famed Indonesian surf break, Keramas wear's its boldness, and distinctiveness on its sleeve. Featuring a sharp square lens shape with a light top-to-bot tom taper and subtle key-hole bridge, this handmade frame is made from Costa's Bio-Acetate material and as a member of the Del Mar collection, is only available in 580 Glass. These 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: Frame: Costa's Bio-Acetate material580 lenses: Scratch resistant and enhances clarity20% thinner and 22% lighter than other polarized lenses on the market Costa Keramas Black Frame Sunglasses w/Gray 580G Lenses 06S2015-20150154