wherein said front end portions and {HEAD ~ front gap portions} are in {TAIL ~ the front direction} of the movement of the shoe while said rear end portions and rear gap portions are rearward respectively to said front face portions and said front gap portions 
in
wherein said front end portions and { HEAD ~ front gap portions } are in { TAIL ~ the front direction } of the movement of the shoe while said rear end portions and rear gap portions are rearward respectively to said front face portions and said front gap portions
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH