Abstract: A function-adapted three-dimensional foam structure (2) for a vehicle seat (4) has first foam structure planes (6) to ensure a constant compressive strength of the foam structure (2) in two spatial directions x, y, second foam structure planes (8) to ensure a length variance of the foam structure (2) in a spatial direction z, that is perpendicular to the spatial directions x and y. The first foam structure planes (6) and the second foam structure planes (8) are formed and distributed within the foam structure (2) such that the compressive strength of the foam structure (2) is constant in the spatial directions x, y independent of the length-wise expansion of the foam structure (2) in the spatial direction z.