All Dragon products are designed with safety and durability in mind, and the Calaca 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. And all Dragon frames are armed with their exclusive Variable Configuration Geometry (VCG) technology - a design process that gives you crystal-clear, no-distortion vision at any point of view through the lens curve.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.