Dirty Dog Eyewear uses metal frames of extremely high quality which is guaranteed by their sophisticated electroplating & powder coating technologies in combination with epoxy coatings. This offers high grade resistance to oxidation & corrosion resulting in frames that will outlast many others. The strong yet lightweight material provides superior durability & comfort for the wearer. Dirty Dog sunglasses are tested rigorously to ensure they pass the high standards set by Dirty Dog. Dirty Dog sunglasses are equipped with advanced lens technology in POLARIZED POLYFILTER & POLYCARBONATE lenses. Dirty Dog lens technology has created stronger lenses making them safer & less susceptible to damage