the other surface mesh structure 10 so the multiple breathing holes are also progressively reduced from large to small and the primary and secondary fibers 12 are circular in cross section with further reference to fig5 and 6 in a second embodiment of the present invention the multilayer mesh structure 1 a has four stacked mesh layers 10 a wherein the cross section of the primary fibers 11 and secondary fibers 12 are rectangles with reference to fig8 in a third embodiment of the present invention the multilayer mesh structure 1 b has four mesh layers 10 b wherein each mesh layer 1 b has alternatively arranged primary fibers 11 11 a respectively having circular and rectangular cross sections and alternatively arranged secondary fibers 12 12 a respectively having circular and rectangular cross sections with further reference to fig9 and 10 in a fourth embodiment of the present invention the multilayer mesh structure 1 c has six mesh layers 10 10 a 10 b wherein the cross section of the primary and secondary fibers 11 12 of one surface mesh layer 10 and the mesh layer 10 adjacent to the surface mesh layer 10 are circles the cross sections of the primary and secondary fibers 11.