Costa 400P - Plastic These lenses have earned a reputation for being impact- and scratch-resistant. They are made to handle the harsh environments all outdoorsmen face every day. Costa 400G- Lightwave™ Glass These are the polarized lenses that put Costa on the map and they still outperform the competition. They are 22% lighter and 20% thinner than the average polarized glass. Costa 580P - Plastic These C-Wall™-coated lenses are lightweight, impact-and scratch-resistant and polarized. They outperform every other lens in its class with U.S. Patent 7,506,977. Costa 580G - Lightwave™ Glass This is Costa's most hi-tech polarized lens and it's 20% thinnner and 22% lighter than average polarized glass.