e and/or polyester woven with different orientations: weft, warp, oblique;the fibers of the substrate are impregnated with resins such as phenolic resins, polyurethane resins, epoxy resins, natural or synthetic rubbers which are designed to transmit the load to the entire set of fibers, impregnation being such as to avoid creating a compact layer in order to avoid compromising breathability.VIII.