A liner tube suitable for lining underground pipes and drains, preferably underground wastewater drains, made of a tube-shaped, inner, single or multi-layer, liquid-tight plastic film letting at least 80% of UV radiation in the wavelength range from 200-400 nm pass through for curing the substrate material, and of an outer, tube-shaped, multi-layer plastic film, and of a single or multi-layer substrate disposed between the two tube-shaped plastic films and impregnated with a reactive plastic resin, the outer tube-shaped plastic film being made of an opaque sequence of layers of (a) optionally a colored layer (a) based on at least one thermoplastic olefin homopolymer or copolymer as the outermost layer of a liner tube, (b) an opaque layer (b) based on a thermoplastic, optionally modified olefin homopolymer or copolymer and further comprising at least one organic and/or inorganic substance, such that the layer (b) absorbs more than 90% of UV radiation in the wavelength range from 200-400 nm acting from the outside and of short-wavelength, visible light in the wavelength range from 400-500 nm, preferably from 400-450 nm, acting from the outside, (c) an inner barrier layer (c) against oxygen, water vapor, or oil, (d) a layer (d) based on an optionally modified thermoplastic olefin homopolymer or copolymer as an optional bonding agent layer, (e) a layer (e) based on at least one thermoplastic olefin homopolymer or copolymer and further comprising at least one substance such that the layer (e) reflects at least 40% of UV radiation in the wavelength range from 200-400 nm, the substance preferably being selected from the group of organic compounds, inorganic compounds, metals, metal alloys, metal compounds, mixtures of two or more of said compounds, mixtures of at least one of said compounds and one metal, and the layer (e) being a layer directly adjacent to the impregnated UV-curable substrate material, and the plastic film neither comprising a metal coating nor being made of a metal foil. (a) optionally a colored layer (a) based on at least one thermoplastic olefin homopolymer or copolymer as the outermost layer of a liner tube, (b) an opaque layer (b) based on a thermoplastic, optionally modified olefin homopolymer or copolymer and further comprising at least one organic and/or inorganic substance, such that the layer (b) absorbs more than 90% of UV radiation in the wavelength range from 200-400 nm acting from the outside and of short-wavelength, visible light in the wavelength range from 400-500 nm, preferably from 400-450 nm, acting from the outside, (c) an inner barrier layer (c) against oxygen, water vapor, or oil, (d) a layer (d) based on an optionally modified thermoplastic olefin homopolymer or copolymer as an optional bonding agent layer, (e) a layer (e) based on at least one thermoplastic olefin homopolymer or copolymer and further comprising at least one substance such that the layer (e) reflects at least 40% of UV radiation in the wavelength range from 200-400 nm, the substance preferably being selected from the group of organic compounds, inorganic compounds, metals, metal alloys, metal compounds, mixtures of two or more of said compounds, mixtures of at least one of said compounds and one metal, and the layer (e) being a layer directly adjacent to the impregnated UV-curable substrate material,