Variable Configuration Geometry (VCG) is at the heart of the Dragon technologies with the Roadblock model. It means you get crystal clear, no-distortion optics from any angle of view through the lens, and that's mighty important for the longevity of all those tiny optical nerves that work hard every day.
A high grade super polymer material, grillamid, forms the durable and flexible frame and the low molecular carbon based lenses provide you with total protection from all UV light, and the harmful blue light that many fashion sunglass brands fail to even speak of.