The second yarn 24 comprises a core 34 of elastic material such as {HEAD ~ rubber} which is helically wrapped with {TAIL ~ an inner covering} 36 defined by a fiber or filament such as polyester 
is helically wrapped with
The second yarn 24 comprises a core 34 of elastic material such as { HEAD ~ rubber } which is helically wrapped with { TAIL ~ an inner covering } 36 defined by a fiber or filament such as polyester
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH