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