Dual density Nitrile Rubber/PU sole construction. Removable extra thick PU insock. SRC slip resistant and Anti-static sole. Fuel and Oil resistant, Non-marking sole. Flex zone technology. 200J impact resistant composite toe cap and TPU toe cover. Out sole heat resist to 300 degrees Celsius. YKK Zip sided. Meets AS 2210.3:2019 Certified by BSI BMP No 622279