Pipeline (10) for a fluid to be transported, in particular in a motor vehicle, comprising: an inner pipe (12) configured to be crossed by the fluid to be transported, and a sheath (15). The sheath (15) comprises: an outer pipe (14), and a plurality of tubular portions (18) defining channels (16). The tubular portions (18): are radially interposed between the inner pipe (12) and the outer pipe (14), extend longitudinally along the outer pipe (14), are made as one piece with the outer pipe (14), and are mutually spaced apart, thus forming interspaces (17).