Nanocarbon toe cap: Ultralight high-tech material, metal free with no thermal or electrical conductivity. SRC slip resistant soles pass both SRA and SRB slip resistant tests, they are tested on both steel and ceramic surfaces. Metal free, super flexible and ultralight puncture resistant midsole. Covers 100% of the bottom area of the last, no thermal conductivity. Breathable upper: Increased moisture and temperature management for extended wearer comfort. Ligero2 S1P Mid Safety Boot