These boots features full grain leather, with a rich oil feel. It also has nylon, mesh lining, Climasphere™ sock lining, rubber midsole & a T3 rubber outsole. Cat® footwear has slip-resistant soles reducing the risk of slips & falls. Caterpillar® steel toe boots are rated ANSI Class 75 which is the highest available strength for impact & compression. These boots also rate at ANSI Z41 PT99 I/75 C/75 EH for Electrial hazard. Special EH construction protects the wearer against open circuits up to 600 volts in dry conditions.