When the retractable/deployable bolster is retracted {HEAD ~ the closure mechanism} is positioned over the retractable/deployable bolster to prevent {TAIL ~ the retractable/deployable bolster} from protruding from the top surface 
When the retractable / deployable bolster is retracted { HEAD ~ the closure mechanism } is positioned over the retractable / deployable bolster to prevent { TAIL ~ the retractable / deployable bolster } from protruding from the top surface
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH