509's???industry-first Fuzion Lens combines the inner and outer lenses of a traditional dual-pane???lens into a fuzed and bonded single pane ventless lens. Designed specifically for???high speed, high octane trail riding that requires a maximum field of view. Eliminating???the lens gasket and fuzing the Super Anti-Fog inner and PC outer lens into one optically???clear, the ventless lens provides an unmatched field of view with less diffusion.