Sun, rain, mud, sleet, or sand--serve it up, and the Zeal Cota Sunglasses will handle it. The ultralight Z-Resin frame won't weigh you down on long rides or runs, and it's made from plant-based materials to reduce the use of petroleum-based plastics. The e-llume lens is also made from plant-based materials, but don't think for a second that Zeal sacrificed optical quality for eco-friendliness. It meets the highest standards of clarity, plus it's polarized to reduce glare and features hydrophobic and oleophobic coatings to repel whatever gets in your way. Did we mention the lens is interchangeable for when light conditions are unpredictable' Or that you can customize the fit for optimal comfort' Yep, the Cota Sunglasses are pretty awesome. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.