{HEAD ~ A substantial portion} of {TAIL ~ the polyisobutylene} has a molecular weight greater than approximately 30,000 and the relative weight ratio between the polyisobutylene and the fibers having polyisobutylene disposed thereon is between approximately 1 to 10 wt % polyisobutylene to approximately 90 to 99 wt % fibers 
of
{ HEAD ~ A substantial portion } of { TAIL ~ the polyisobutylene } has a molecular weight greater than approximately 30,000 and the relative weight ratio between the polyisobutylene and the fibers having polyisobutylene disposed thereon is between approximately 1 to 10 wt % polyisobutylene to approximately 90 to 99 wt % fibers
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