Polyisobutylene is disposed on {TAIL ~ the surface} of the fibers to form treated fibers having {HEAD ~ a treated thickness} 
Polyisobutylene is disposed on { TAIL ~ the surface } of the fibers to form treated fibers having { HEAD ~ a treated thickness }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD