In a safety belt for vehicles a belt webbing section is composed of two superposed belt webbing plies connected by a rippable seam. The rippable seam comprises seam sections which extend alternatingly transversely in relation to the center line of the belt webbing from one side of such center line to the opposite side and then at least approximately in the longitudinal direction and then back again. In the rippable seam two respective stitches in a seam section extending transversely in relation to the center line of the belt webbing are offset in relation to one another in the longitudinal direction.