Frame: Nylon. Hinge: 5 Barrel Metal - Optical Grade. Lens Shape: Large Rectangle. Temple: Nylon with Metal Plate. Logo: Metal Fox Head Plate. Lens: 6 Base Polycarbonate. All Fox Eyewear lenses have been tested and manufactured by Carl Zeiss Vision Sunlens and offer outstanding optical quality, performance, UV protection, scratch resistance and impact protection.