The rear side insulation is preferably {HEAD ~ an inflatable bladder} composed of {TAIL ~ flexible tubular or modular segments} 
composed of
The rear side insulation is preferably { HEAD ~ an inflatable bladder } composed of { TAIL ~ flexible tubular or modular segments }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL