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