Base Curve: 6Acetate: Acetate is hypoallergenic| lightweight| and can come in many different coloursPolycarbonate: Polycarbonate is lightweight| comfortable| impact resistant| and provides UV protectionA special formulation of polycarbonate| exclusive to Revo sunglasses that provide superior optics| impact-resistance and great overall vision and performanceRevo Serilium™ lenses use the finest optical-quality lens material and have strict manufacturing processes to avoid stress and limit birefringence Revo sunglasses with LMS™ technology selectively manage blue light to provide clear sharp vision in all conditions and maximum protection for your eyes and against potentially harmful UV and HEV rays