<p>A lining material for pipe lines, especially those buried in the ground such as sewage pipe lines and a process for providing such pipe lines therewith are disclosed. The material comprises a flexible tubular film (2), a resin-impregnated sheet (3) covering the outer surface of the flexible tubular film, and a tubular covering material (4) having a strong resistance to tensile force. For lining pipe systems of varying diameter the sheet may be constructed by several units of sheet fractions (3') having overlapping edges (5') in both laterial and longitudinal end portions so as to be slidable each other in opposite directions to form a tubular sheet. <IMAGE> <IMAGE></p>
