Abstract: A hollow chamber profile section (10, 70) serves for the utilisation of solar energy, in particular for covering absorption rooves or the like, with a transparent upper part (12, 72) and a radiation-absorbing lower part (14), which are jointly produced by two-component extrusion from plastics material and are connected to one another in the interior of the hollow chamber profile section (10, 70) by webs (20, . . . , 30) running in the longitudinal direction, in such a way that parallel flow channels (34, . . . , 48) for a heat transfer medium are formed. The upper part (12, 72) is provided on its outside with a covering layer (50) that is produced jointly with the upper part (12, 72) and the lower part (14) by two-component extrusion combined with co-extrusion from a plastics material that absorbs the ultraviolet component of solar radiation and is transparent to other components.