Dirty Dog shades boast a heavy technological history. The Dirty Dog Company began in 1980 as the collective effort of several designers and scientists. They worked together to create TR90, a lightweight and formidable compound which is virtually unbreakable. TR90 enables Dirty Dog eyewear owners to participate in spectacular and daredevil sports. This compound, combined with shatterproof polyfilter polycarbonate and decenterized lenses, allows the sunglasses to block UV rays completely and withstand heavy falls while maintaining excellent vision performance for the wearer.