we build a 3D model of your entire face, including your nose. We then 5-axis CNC the shape of your nose into the frame, creating completely custom nosepads. We also use the unique location of each of your ears to craft unique left and right temples arms, each with custom length and drop angles to match the asymmetric location of each ear (everyone has a bit of asymmetry in their face). We also customize the temple arm angles based on the base curve (front curvature) of your ultimate Rx lens, so it all fits together as a system and will never stretch out over time. It fits perfect out-of-the-box, with no adjustments required.