Midsole structure for a shoe

A sole structure for a heel region of a shoe, said sole structure comprising a midsole structure and an outsole that is disposed below said midsole structure and is adapted to contact a ground surface under the shoe, wherein said midsole structure comprises:

• a harder upper midsole formed of a first elastic material extending from a lateral side edge through a widthwise central part to a medial side edge of said midsole structure at the heel region;
• and
• a softer lower midsole formed of a second elastic material that is softer than said first elastic material, wherein said softer lower midsole is disposed below at least a portion of said harder upper midsole and extends from said lateral side edge to at least said widthwise central part of said midsole structure at the heel region;
• wherein on every cross-section extending widthwise through said midsole structure from said medial side edge through said widthwise central part to said lateral side edge at the heel region, said harder upper midsole is thicker than said softer lower midsole at least at said medial side edge of said midsole structure at the heel region, and said softer lower midsole is thicker than said harder upper midsole at said widthwise central part of said midsole structure at the heel region;
• and
• wherein a boundary between said harder upper midsole and said softer lower midsole does not appear on a top surface of said midsole structure at the heel region, and said top surface of said midsole structure at the heel region is formed entirely by a top surface of said harder upper midsole.