{TAIL ~ a) an elastic support} exhibiting {HEAD ~ a resilience} of at least 80%; and 
{ TAIL ~ a ) an elastic support } exhibiting { HEAD ~ a resilience } of at least 80 % ; and
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH