Abstract: The present disclosure relates to a method of manufacturing a breast prosthesis, wherein a film pouch of at least three film layers is welded for the production of at least two chambers. First, the film pouch is inserted into a prosthetic mold and the outwardly disposed chamber is filled with a mass; the mold is closed with a rear mold part having a specially defined contour and the transparent mass is cross-linked so much that it remains stable in shape in the further production steps. Subsequently, the inner chamber is filled with a second, largely light impermeable mass comprising light fillers and a mold half comprising a shallow cavity is inserted to completely cross-link the masses located in the chamber at a raised temperature.