Proof's Polarized 45th Parallel Eco Sunglasses are classic shades made with the environment in mind. Instead of a standard acetate construction common in sunglasses, the 45th Parallel Eco's frame is a cotton-based acetate with sustainably sourced wood at the temple tips. Proof gave even more detailed attention to the frame with unique laser etching inside the bridge for your own entertainment. As for the lenses, they're polarized and anti-reflective to practically eliminate glares from water, windows, and even that twinkle in the corner of your eye. 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.