Raen Vista Sunglasses are constructed with attention to detail. All Raen frames are handrafted from Zyl acetate, a high-quality material derived from wood pulp and cotton fibers, giving each pair of sunglasses a quality look and feel. Carl Zeiss lenses will keep your vision crispy, and stainless steel hinges withstand normal wear. 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.