Modular insert system for shoe soles

A shoe, comprising:

• a sole comprising a midsole part and an outsole part, each of the midsole part and the outsole part divided into a heel section, a midfoot section and a forefoot section, wherein:
• the midsole has an upper, foot-facing surface and the outsole part has a lower, ground-facing surface, and the outsole comprises a plurality of hollow cavities only in the heel section and the midfoot section, each cavity extending from the outsole along an axis which is substantially orthogonal to the lower ground-facing surface into the midsole;
• and
• a plurality of support adjustment elements configured to be inserted into the hollow cavities and extending below the lower ground-facing surface of the outsole so as to adjust a support hardness of the midsole at the location of said each cavity, wherein:
• the outsole has a higher thickness in the forefoot section than in the heel section and in the midfoot section and each cavity comprises at least two elongated compression elements protruding from an inner surface of the hollow cavity towards a center of the hollow cavity.