Double-density sole with 12 mm heel, non-slip, with two layers: one in expanded polyurethane, soft, for absorption and distribution of impacts when walking. The other one layer is compact, in nitrile rubber (butadiene nitrile), with resistance to contact with heat (300° up to 60 seconds), greater resistance to derivatives of petroleum, greases, oils and some solvents, identi_ed by the red logo.