Advantageously, {HEAD ~ these one or more internal features} can be molded to the inner layer with {TAIL ~ a single molding tool} 
molded with
Advantageously , { HEAD ~ these one or more internal features } can be molded to the inner layer with { TAIL ~ a single molding tool }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL