A system is provided for application of a layer permanently adhering to the inside of a breast prosthesis formed as a shell-shaped body made from a soft-elastic material, in which a two-component silicone rubber forming the adhesive layer is injected into a mold prior to curing of the body and then cured together with the body. Alternatively, the two-component silicone rubber forming the adhesive layer is first cured in a shell, with the shell then being applied to the body in a mold and then cured again with the body. In a third alternative, the adhesive layer is cured while being joined to a carrier film, with the carrier film then being adhered to the prosthesis sheath which is then filled with addition-vulcanizing two-component silicone rubber and cured in a mold.