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