Torsion-resistant three-density high rigidity midsole

A torsion-resistant three-density high rigidity midsole, comprising:

• a midsole body including a front region, a back region, and a middle region integrally connected between said front region and said back region, said front region having a front region density and a front region length, said back region having a back region length, and a back region density smaller than said front region density, said middle region having a middle region length, and a middle region density greater than said front region density, each of said front region length, said back region length and said middle region length extending along a longitudinal direction, a sum of said front region length and said middle region length being greater than said back region length;
• a cushion body integrally formed on a top surface of said midsole body and covering said front region, said middle region and said back region;
• and
• an elastic piece sandwiched between said top surface of said midsole body and a bottom surface of said cushion body at a position corresponding to said middle region.