Safety shoe from Cat. A ISO 20345:2004: S1P HRO SRC Outer of mesh, suede & synthetic. Lace up front. Inner of mesh. Steel cap & penetration protection. Midsole of cushioning EVA with built in pronation support. Removable EVA inner sole with gel technology. Outer sole of a mix of rubber/nitrile which is heat resistant up to 300 degrees.