The sole of this leather steel toe safety shoes for men is made of double-density PU. The density of midsole and outsole is different. It can be made of two colors(outsole one color, midsole the other color),making the whole shoe look more better.Normally the outsole is made of low density,so it provides a high abrasion working surface. But the midsole is made of high density PU,so the soft PU midsole provides good impact absorption and wearing comfort.The soft midsole can share some beading stress for outsole bottom. So the outsole is hard to crack.