The inner core can be comprised of {HEAD ~ cork}, kapok, rubber or a blend of {TAIL ~ thermoplastic polymers} and copolymers 
The inner core can be comprised of { HEAD ~ cork } , kapok , rubber or a blend of { TAIL ~ thermoplastic polymers } and copolymers
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH