Drawing inspiration from the stages and bars that line 6th Street in Austin, Texas and the musicians who play there, the Zeal 6th Street Polarized Sunglasses embody the spirit of the 'Live Music Capital of the World'. Of course, just because the style is old-school, doesn't mean the technology has to be. Theses eco-friendly shades sport an e-llume lens made from a plant-based material called Z-Resin to eliminate the need for harmful petrochemicals in the manufacturing process, and the Eco-Acetate arms are made with post-consumer acetate to reduce waste so you can hit the town with both style and a clear conscience. Plus, the lenses are polarized to reduce glare from reflective surfaces so you can always see clearly. 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.