Preferably, {HEAD ~ the conductive elements} have the form of a conductive yarn with one or more of: {TAIL ~ a core} of insulating material, an electrical resistance heating element, e.g., about the core, and a sheath material surrounding the electrical resistance heating element  
Preferably , { HEAD ~ the conductive elements } have the form of a conductive yarn with one or more of : { TAIL ~ a core } of insulating material , an electrical resistance heating element , e.g. , about the core , and a sheath material surrounding the electrical resistance heating element
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH