Abstract: The invention relates to a breast prosthesis having an elastically deformable outer body whose outer surface is patterned on the shape of the breast and having a plastically deformable inner body whose inner surface can adapt to irregularities of the tissue. In accordance with the invention, the inner surface of the inner body has a three-dimensional structure and/or is provided with a textile that is designed such that a ventilation of the tissue surface can be achieved.