Rock Fall Volta Safety Trainer RF140 EH SRC Black Protective toecap and midsole, Volta is an electrical hazard trainer developed with specialist comfort materials that are certified to withstand electrical risks of 18kV in accordance with the ASTM F2412-18 test method, including BOA® Fit System, shock absorbing dual density EVA nitrile rubber outsole and Activ-Step® foam footbed.