The Flex SideShield, from Bouton, is a welcomed addition to safety spectacles. They are molded to a bendable softness, but are still rugged enough to absorb the energy from an impact. The shields still allow spectacles to fold-up correctly for proper storage. They are easy to install, because they require no tools or parts - simply weave through the spectacle's temple. They block 100% of harmful UV. Conforms to ANSI Z87.1 standards.