treatment bath contains the one or more co polymers and at least one of the additional components more preferably at least two of the additional components in a most preferred embodiment the treatment composition comprises an aqueous solution or dispersion of ethylene vinyl acetate copolymer a colorant and an antimicrobial agent most preferably the components contained in the treatment composition are chemically compatible i e do not detrimentally react with one another note this does permit reaction or interaction between components so long as the reaction or interaction is not detrimental to the formation of the co polymer coating or other desired properties such as color antimicrobial properties or anti static properties etc the treatment composition is preferably aqueous although non aqueous compositions are also included within the present invention when non aqueous compositions are used proper precautions must be taken for removal of organic vapors during the drying step at the heated drying roller the treatment composition can be used at ambient or room temperature or can be heated or cooled as desired the yarn component to be treated can be made of or contain any natural or synthetic fiber alone or in combinations or blends including but not limited to cotton wool nylons polyesters polyethylenes polypropylenes aramids glass and metal fibers the component to be treated may be in the form of a monofilament fiber multifilament fiber yarns made from these fibers composite yarns or the components of composite yarns such as the core or individual sheath or wrap layers of the composite yarn in a preferred embodiment the process is used to treat the core of a composite yarn such as those disclosed in u s pat nos 5.