Water vapour-permeable flat composite component consisting of at least one layer (i) not consisting of thermoplastic polyurethane and selected from the group consisting of layers of textiles, nonwovens, thermoplastic polymers, paper or cardboard or metal meshes with mechanically produced holes, at least one layer (ii) composed of polyether polyol- and polyester polyol-based thermoplastic polyurethane and optionally further layers (iii) composed of thermoplastic polyurethane that do not directly adjoin the layer (ii) with a flat join, where the layer (ii) consists of a thermoplastic polyurethane obtainable from the reaction of the components consisting of A) at least one organic diisocyanate, B) at least one component having two hydroxyl groups and in each case having a number-average molecular weight of 60 to 490 g/mol as chain extender, C) a component consisting of one or more polyether polyols each having a number-average molecular weight of 500-5000 g/mol, of which at least one polyether polyol (C1) contains ethylene oxide units, D) 10% to 85% by weight, based on the total amount of C) and D), of one or more aliphatic polyester polyols each having a number-average molecular weight of 500-5000 g/mol, in the presence of E) optionally catalysts, F) optionally assistants and/or additives, where the molar ratio of the NCO groups in A) to the isocyanate-reactive groups in B), C) and D) is 0.9:1 to 1.2:1, characterized in that the total content of ethylene oxide units in component C) is at least 5% and not more than 45% by weight, based on the total weight of components C) and D), and the number-average functionality of the sum total of all the polyols in C) and D) is 1.8 to 2.5, and the content of ethylene oxide units (X in % by weight) in component C), relative to the molar ratio Y of chain extenders B) to the sum total of components C) and D), is below the value of X which arises from the formula X (% by weight) = 7.35 * Y + 13.75. A) at least one organic diisocyanate, B) at least one component having two hydroxyl groups and in each case having a number-average molecular weight of 60 to 490 g/mol as chain extender, C) a component consisting of one or more polyether polyols each having a number-average molecular weight of 500-5000 g/mol, of which at least one polyether polyol (C1) contains ethylene oxide units, D) 10% to 85% by weight, based on the total amount of C) and D), of one or more aliphatic polyester polyols each having a number-average molecular weight of 500-5000 g/mol, in the presence of E) optionally catalysts, F) optionally assistants and/or additives, where the molar ratio of the NCO groups in A) to the isocyanate-reactive groups in B), C) and D) is 0.9:1 to 1.2:1, characterized in that the total content of ethylene oxide units in component C) is at least 5% and not more than 45% by weight, based on the total weight of components C) and D), and the number-average functionality of the sum total of all the polyols in C) and D) is 1.8 to 2.5, and the content of ethylene oxide units (X in % by weight) in component C), relative to the molar ratio Y of chain extenders B) to the sum total of components C) and D), is below the value of X which arises from the formula X (% by weight) = 7.35 * Y + 13.75. <EOS>