The two pads are separated by a liquid barrier material so that {HEAD ~ the insulating pad} is maintained in {TAIL ~ a dry operable condition} 
is maintained in
The two pads are separated by a liquid barrier material so that { HEAD ~ the insulating pad } is maintained in { TAIL ~ a dry operable condition }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL