{HEAD ~ The barrier} may be made of rigid material, for example, constructed from a plurality of sectors but is preferably made from {TAIL ~ a flexible material} so that it can be fitted around an existing conventional insulator 
is preferably made from
{ HEAD ~ The barrier } may be made of rigid material , for example , constructed from a plurality of sectors but is preferably made from { TAIL ~ a flexible material } so that it can be fitted around an existing conventional insulator
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH