Sole and shoe with haptic feedback

A sole for a shoe, the sole comprising:

• a. a sole component comprising a midsole and/or insole, wherein the midsole and/or insole is formed from particles of an expanded material which are fused at their surfaces;
• b. wherein the midsole and/or insole comprises a cavity, wherein the cavity is filled with an amount of loose particles formed from an expanded material;
• wherein the expanded material of the midsole and/or insole is the same expanded material as the expanded material of the loose particles;
• c. wherein the loose particles provide haptic feedback to a user of the sole during an athletic activity and wherein the loose particles have a weight at least twice the weight of the surrounding midsole material of a same size;
• d. wherein the loose particles are adapted to change an effective weight of the sole during use of the sole, the effective weight corresponding to a perceptible weight by a user;
• and
• e. wherein the expanded material is expanded ethylene-vinyl-acetate (eEVA), expanded thermoplastic urethane (eTPU), expanded polypropylene (ePP), expanded polyamide (ePA), expanded polyether block amide (ePEBA), expanded polyoxymethylene (ePOM), expanded polystyrene (ePS), expanded polyethylene (ePE), expanded polylactide (ePLA), expanded polyethylene terephthalate (ePET), expanded polybutylene terephthalate (ePBT), or expanded thermoplastic olefin (eTPO).