Tubular liner for sewer rehabilitation, with at least: - one inner tubular film; - with a resin-carrier layer surrounding the inner tubular film, wherein the resin is curable by means of UV radiation; - with a mechanically protective outer film system surrounding the resin-carrier layer, with at least one outer film (7a; 7a, 7b) extending in the longitudinal direction of the tubular liner, wherein the longitudinal edges of the outer film or the outer films (7b, 7c) are connected to each other in an overlapping manner in the circumferential direction of the tubular liner, wherein the at least one connecting point resulting from this, upon the elongation in the radial direction during the insertion of the tubular liner in a sewer to be rehabilitated, is elongated and may break, and wherein the at least one outer film (7a; 7b, 7c) features at least one layer that is essentially impermeable for UV radiation and, if applicable, visible light, characterized in that each of the at least one outer films (7a; 7b, 7c) features at least one layer made of a material that is mechanically very stable and is essentially not able to elongate or able to elongate only very poorly, wherein the at least one outer film (7a; 7b, 7c) is formed as a reinforced film, for example reinforced by a fabric, threads, fibers, grid or mesh, or formed as a reinforced fabric, in particular a PVC-reinforced fabric or a Kevlar (aramid fiber) fabric, and wherein the specified mechanical stability and poor ability to elongate of the at least one outer film (7a; 7b, 7c) are defined by one or more of the following mechanical properties: - the elongation at break in a longitudinal direction (εB) and elongation at break in a transverse direction (εB) in accordance with DIN EN ISO 527-3 and DIN EN ISO 527-3, respectively, is less than 200%, preferentially less than 100%, most preferentially less than 50%; - the trap tear resistance in a trapezoidal manner in a longitudinal direction or in a trapezoidal manner in a transverse direction in accordance with DIN 53363 and DIN 53363, respectively, is greater than 100 N, preferentially greater than 200 N; and/or - the puncture resistance in accordance with ASTM E 154 is greater than 300 N, preferentially greater than 500 N, in particular preferentially greater than 800 N. - one inner tubular film; - with a resin-carrier layer surrounding the inner tubular film, wherein the resin is curable by means of UV radiation; - with a mechanically protective outer film system surrounding the resin-carrier layer, with at least one outer film (7a; 7a, 7b) extending in the longitudinal direction of the tubular liner, wherein the longitudinal edges of the outer film or the outer films (7b, 7c) are connected to each other in an overlapping manner in the circumferential direction of the tubular liner, wherein the at least one connecting point resulting from this, upon the elongation in the radial direction during the insertion of the tubular liner in a sewer to be rehabilitated, is elongated and may break, and wherein the at least one outer film (7a; 7b, 7c) features at least one layer that is essentially impermeable for UV radiation and, if applicable, visible light, - the elongation at break in a longitudinal direction (εB) and elongation at break in a transverse direction (εB) in accordance with DIN EN ISO 527-3 and DIN EN ISO 527-3, respectively, is less than 200%, preferentially less than 100%, most preferentially less than 50%; - the trap tear resistance in a trapezoidal manner in a longitudinal direction or in a trapezoidal manner in a transverse direction in accordance with DIN 53363 and DIN 53363, respectively, is greater than 100 N, preferentially greater than 200 N; and/or - the puncture resistance in accordance with ASTM E 154 is greater than 300 N, preferentially greater than 500 N, in particular preferentially greater than 800 N.