Costa Del Mar Sunglasses with Costa 400 Lenses

The original. Designed to perform. Built to last. CR-39: Lightweight Monomer with exceptional optical resolution. LightWAVE Glass: Polished silica material offering exceptional quality, optical clarity and maximum scratch resistance. They are 20% lighter and 22% thinner than ordinary glass lenses. Polycarbonate: Virtually shatterproof plastic 40 times stronger than glass.