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