An embodiment of the present invention resides in {HEAD ~ a polygonal rib structure} wherein the polygonal rib structure is {TAIL ~ a shock absorbing member} 
An embodiment of the present invention resides in { HEAD ~ a polygonal rib structure } wherein the polygonal rib structure is { TAIL ~ a shock absorbing member }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL