The invention relates to a protective tube comprising a plurality of threads (1) which are braided, knit-braided, knitted or woven to one another such as to form a mesh. The invention is characterised in that the tube comprises mesh-fixing means (2, 3) which can be torn such that, upon tearing, the mesh can stretch and reduce the inner diameter thereof. The fixing means comprise a plurality of thermoplastic polymeric threads (2) which are soldered to the mesh and which are disposed in parallel on said mesh. In this way, electric cables can be easily mounted inside the tube since, at the outset, the tube is held open with a greater diameter thanks to the fixing means.