100% Non-metallic, Flexible Non-metallic Puncture-Resisting Textile Insole Material, ASTM F2413-11 M I/75/C/75 COMPOSITE SAFETY TOE, Eh Rated, Tested For and Meets CAN/CSA-Z195 18,000 Volts Electric Shock Resistance Standard. Meets Or Exceeds CAL/OSHA Title 8 Requirements For Foot Safety Toe Protection And Puncture Resistance, Quick Release Elastic Gore, Pull Straps.