The contrast between the handcrafted, cotton-based acetate and sustainably-sourced wood is what makes Proof Eyewear's Banks Sunglasses so uniquely stylish. And designed for lifestyles that teeter on the edge of the city and the mountains, a polarized lens protects the eye from intensive glares and exposure to harmful rays while the water and sweat-resistant finish is comfortable to wear while you actively hike or commute. A matching wooden case and microfiber pouch keep your glasses safe when the trail makes a turn into the shade. 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.