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