The invention features {HEAD ~ a rubber thread} that has, in cross section, {TAIL ~ two or more rubber portions} 
has
The invention features { HEAD ~ a rubber thread } that has , in cross section , { TAIL ~ two or more rubber portions }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL