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