Preferably, {HEAD ~ the inner core} is comprised of an ethylene vinyl acetate copolymer, {TAIL ~ an ethylene carboxylic acid copolymer} or a blend of both 
is comprised of
Preferably , { HEAD ~ the inner core } is comprised of an ethylene vinyl acetate copolymer , { TAIL ~ an ethylene carboxylic acid copolymer } or a blend of both
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH