Bell's Hyper Shield Anti Fog Insert by Fog City, designed specifically for Bell auto racing shields, converts your shield into the highest performing Anti Fog, UV blocking visor available for sale today. The optical 20-mil polycarbonate insert is imbeded with a patented anti-fog coating technology that prevents shield fogging and absorbs over 98% of harmful UV rays. The insert is easy to install thanks to the "peel and stick" system with no tools and without damaging your shield. Installation instructions are provided in the package.