A multi-layered film in the form of a hose-shaped outer film for an insert hose of a pipe rehabilitation system includes silver-colored pigments in at least two layers of the film, or a metallization applied on both outer layers of the film, or silver-colored pigments in at least one layer of the film and a metallization is applied on an outer layer of the film. At least one UV absorber is inserted in at least one or several layers of the film of the film. The entire film is permeable to UV light and visible light in a wavelength range from 200 to 800 nm at a rate of less than 0.1%, and is opaque. The UV radiation and visible radiation are reflected in a wavelength range from 200 to 800 nm.