about one half of that of the final product and without removing the rearranged entangled web from the forming belt adding another web of fibers on top of the first and subjecting the combined layers to the rearranging entangling step sequential entangling is illustrated in the examples the principal novelty in the process and apparatus of the invention resides in the use of the special forming belt an illustration of such a belt is shown in fig1 and 15 the belt is woven from fine warp monofilaments 36 which extend in the direction of travel of the belt and fill monofilaments of two different sizes a heavier fill monofilament 38 and finer fill monofilaments 34 the belt is woven in such a manner that the topography of the top surface of the belt that is the surface which the fibers will contact has raised parallel ridges alternating with depressions the raised ridges are formed by the heavier fill monofilaments 38 at spaced intervals along said heavier fill monofilaments 38 fine warp monofilaments 36 pass over the heavier fill monofilaments 38 the weave of the forming belt is such that at least two and up to four with the belt shown there are three of the warp monofilaments 36 pass under each heavier fill monofilament 38 between each warp monofilament 36 that passes over the heavier fill monofilament 38 therefore the intervals between said fine wrap monofilaments 36 that pass over the heavier fill monofilaments 38 will usually vary from about two to about four diameters of the fine warp monofilaments 36 in said depressions warp filaments 36 are interlaced with fine fill monofilaments 34 to.