Numa Sport Optics Explorer with Mirrored Copper Lens, Earth The toughest and most comfortable sunglasses you'll ever wear; Kid-proof, accident-proof, life-proof Numa Lite-Flex frame material - super lightweight and resilient; When every gram counts Numa multi-layer shatterproof lenses with smudge-resistant anti-fog hydrophobic, scratch-resistant hard coat and 100% UV A-B-C protection Mirrored Copper lens - bright-light high-contrast lens for everyday use (great for driving) Prescription lenses available in standard, polarized and Transitions from +4.00 to -5.00 strength, with up to a 3.00 ADD for progressives