Further, {TAIL ~ the distance l} between {HEAD ~ the first and second ridges} is substantially the same as that of the conventional boot 
Further , { TAIL ~ the distance l } between { HEAD ~ the first and second ridges } is substantially the same as that of the conventional boot
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH