Preferably the first synthetic material is an aramide filament, and preferably {HEAD ~ the second synthetic material} is {TAIL ~ a pre oxidized filament} 
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Preferably the first synthetic material is an aramide filament , and preferably { HEAD ~ the second synthetic material } is { TAIL ~ a pre oxidized filament }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL