{HEAD ~ The fluid cushion} has a fluid support surface, a retractable/deployable bolster, and {TAIL ~ a closure mechanism} 
{ HEAD ~ The fluid cushion } has a fluid support surface , a retractable / deployable bolster , and { TAIL ~ a closure mechanism }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL