Caye, pronounced "key," is the Spanish word for any small, sandy island formed on a reef. It’s also the natural habitat of these versatile Costa Caye 580 Polarized full-frame nylon wayfarers. Their stainless steel spring hinges help you stay relaxed on the caye, just the kind of place we love to be. The amazing clarity of 580 lenses is available in scratch-resistant glass (580G) and in lightweight, impact-resistant plastic (580P). Revolutionary Costa 580P polycarbonate lenses are feather-light and impact-resistant (two features where glass falls short) while still providing image-popping clarity that rivals the finest optical-quality glass lenses. 580P lenses pass ANSI Z80.3 and ANSI Z87.1 high-impact/velocity testing. These advanced lenses also feature Costa’s C-Wall™ coating for effortless cleaning and durability. C-Wall is chemically fused into the lens during production. This process ensures the protective molecules cover the lens surface perfectly to repel water and keep fingerprints, oils and other contaminants from adhering to the lens. Plus, the C-Wall coating gives the 580P lenses scratch-resistant durability not found in other polycarbonate lenses. In fact, steel-wool scratch tests showed no scratches in 300 cycles – try that with ordinary plastic lenses.