From Steelflex:
Protect your feet with the Puncture Resistant Insole by Steel-Flex®. Nails, pieces of glass and bits of rusty metal present hazards to home do-it-yourselves and professional tradespersons alike. The Steel-Flex® Puncture Resistant Insole can be conveniently stowed in a tool box until needed to provide comfortable, trustworthy protection in an ordinary shoe.
More Information: http://steelflex.com/product/steelflex-puncture-resistant-insoles/
