Costa Del Mar's 580 Polycarbonate provides high clarity, impact- and scratch-resistance along with lightweight all day wear-ability. Copper Polarized cuts glare for eye comfort in a variety of situations, from driving to sight fishing. Costa Del Mar's co-injected bio-based nylon frame material is both tough and durable, while offering a comfortable fit. 100% polarization kills reflected glare and reduces eye strain. Built by hand and backed for life. Every pair of Costa Del Mar Sunglasses includes a limited lifetime warranty.