A thumb break strap or {HEAD ~ flap} or other type of {TAIL ~ retainer} may be used in this embodiment 
of
A thumb break strap or { HEAD ~ flap } or other type of { TAIL ~ retainer } may be used in this embodiment
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH