A process for producing a molding, comprising the following steps: (a) preparing a thermoplastic polyurethane, comprising the reaction of (i) at least one polyisocyanate composition; (ii) at least one chain extender; and (iii) at least one polyol composition, the polyol composition comprising at least one bisphenol derivative selected from the group consisting of bisphenol A derivatives having a molecular weight Mw > 315 g/mol and bisphenol S derivatives having a molecular weight Mw > 315 g/mol, at least one of the OH groups of the bisphenol derivative being alkoxylated, and a polyol selected from the group consisting of polyetherols, polyesterols, polycarbonate alcohols and hybrid polyols; (b) producing a molding (FK*) from the thermoplastic polyurethane, (c) heating the molding (FK*) to a temperature below the temperature at which the molding (FK*) is permanently deformable, and above the switching temperature of the thermoplastic polyurethane, (d) compressing the heated molding (FK*) to give a molding, (e) cooling the molding to a temperature below the switching temperature of the thermoplastic polyurethane, wherein the molding is a foam, wherein the chain extender used in (ii) is a diol having a molecular weight Mw < 220 g/mol, and wherein switching temperature refers to the temperature at which there is a phase transition below the melting temperature of the hard phase. (a) preparing a thermoplastic polyurethane, comprising the reaction of (i) at least one polyisocyanate composition; (ii) at least one chain extender; and (iii) at least one polyol composition, the polyol composition comprising at least one bisphenol derivative selected from the group consisting of bisphenol A derivatives having a molecular weight Mw > 315 g/mol and bisphenol S derivatives having a molecular weight Mw > 315 g/mol, at least one of the OH groups of the bisphenol derivative being alkoxylated, and a polyol selected from the group consisting of polyetherols, polyesterols, polycarbonate alcohols and hybrid polyols; (i) at least one polyisocyanate composition; (ii) at least one chain extender; and (iii) at least one polyol composition, the polyol composition comprising at least one bisphenol derivative selected from the group consisting of bisphenol A derivatives having a molecular weight Mw > 315 g/mol and bisphenol S derivatives having a molecular weight Mw > 315 g/mol, at least one of the OH groups of the bisphenol derivative being alkoxylated, and a polyol selected from the group consisting of polyetherols, polyesterols, polycarbonate alcohols and hybrid polyols; the polyol composition comprising at least one bisphenol derivative selected from the group consisting of bisphenol A derivatives having a molecular weight Mw > 315 g/mol and bisphenol S derivatives having a molecular weight Mw > 315 g/mol, at least one of the OH groups of the bisphenol derivative being alkoxylated, and a polyol selected from the group consisting of polyetherols, polyesterols, polycarbonate alcohols and hybrid polyols; (b) producing a molding (FK*) from the thermoplastic polyurethane, (c) heating the molding (FK*) to a temperature below the temperature at which the molding (FK*) is permanently deformable, and above the switching temperature of the thermoplastic polyurethane, (d) compressing the heated molding (FK*) to give a molding, (e) cooling the molding to a temperature below the switching temperature of the thermoplastic polyurethane, wherein the molding is a foam, wherein the chain extender used in (ii) is a diol having a molecular weight Mw < 220 g/mol, and wherein switching temperature refers to the temperature at which there is a phase transition below the melting temperature of the hard phase. wherein the molding is a foam, wherein the chain extender used in (ii) is a diol having a molecular weight Mw < 220 g/mol, and wherein switching temperature refers to the temperature at which there is a phase transition below the melting temperature of the hard phase.