fabric surfaces to form composite materials for example a woven or knitted fabric can be needled to create fiber entanglement perpendicular to the plane of the fabric by needlepunching together with a second nonwoven sheet or fabric similarly two or more adjacent felt fabric surfaces may be subjected to entangling of their fibers to form a composite material such construction wherein adjoining fabric surfaces are of differing electrical conductivities provides an interface of intermediate conductivity which desirably smooths or ablurs u2245 an electric field gradient applied across the fabric composite thickness in other words the resulting fabric can comprise two or more superimposed webs of different electrical conductivities whose adjoining surfaces provide transition regions comprising entangled conductive fibers from each web associated with the adjoining surfaces the transition regions exhibit electrical conductivities which are intermediate to that of the adjoining webs which serves to more gradually transition conductivity through the resulting fabric 39 s thickness for present purposes conductivity can be described as the degree to which a material interacts either electrically or magnetically with electromagnetic radiation material such as ferrites are considered conductive in terms of the present invention the fabric of the present invention comprises conductive fibers the fibers may be intrinsically conductive e g containing carbon ferrite and or metal preferably held with a binder or melt.