HJC Pinlock Anti-Fog Lens - Light Smoke Pinlock Inserts are available in FOUR different options suited for various riding conditions. Inserts can easily be swapped out to adapt to changing conditions. Pinlock Inserts are created out of a moisture absorbing plastic. The silicone seal on the Pinlock creates an air tight double visor keeping your shield fog free. NOTE: Do not combine a Pinlock tinted lens with a Pinlock prepared tinted shield.