Penguin PS 921 M
Steel Toecaps (200 joules), CE 345-1.
Heat Contact up to 300°C for 60 seconds
It is not recommended to add steel midsole for nitrile rubber outsole as it is hard and strong compared to PU (polyurethane) outsole. Use steel midsole for nitrile rubber outsole will reduce the outsole flexibility by 50%.
It is possible to use steel midsole as per user request