The ambulatory foot movement inside the shoe puts {HEAD ~ pressure} on {TAIL ~ the fluid} and makes it flow from one chamber area to another 
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The ambulatory foot movement inside the shoe puts { HEAD ~ pressure } on { TAIL ~ the fluid } and makes it flow from one chamber area to another
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH