All Dragon products are designed with safety and durability in mind, and the Double Dos is no exception. For example, the nylon frames are forged from the highest grade super-polymer materials known to man. These Micro-Venomite polymers unite in perfect balance to provide ultimate strength and flexibility with virtually no weight to the wearer.As for the lenses, Dragon's low-molecular weight Carbon based lenses are not only optically true, they block just about anything you can throw at them, including 100% of all harmful UV and Blue Light.