Bubble shields from the plastic industry''s glory days in the ''60s were an instant hit with the hip chopper crowd; and have remained a popular safe-riding essential in modern times. The bubble visors are injection molded with highly scratch- and impact-resistant polycarbonate thermoplastic. Anti-fog treatment on shield interior fights moisture build-up from breathing and humidity. Biltwell bubble shields are a snap to install; if you start with the center snap and move outward. To clean your shield; use mild soapy water solution and a microfiber cloth to loosen bugs and road debris; then dry it with a second clean microfiber towel. Every shield color and style provides 91% UV/A and 99% AV/B light resistance based on AATCC-138 test standard.