The extensions 20B and 20C each comprise the other half of a hook and loop fastener; so that {HEAD ~ adjustment} to various head sizes may be effected by {TAIL ~ means} of the placement of the ends of the strap 20A on the mating fastener portions 20B and 20C 
The extensions 20B and 20C each comprise the other half of a hook and loop fastener ; so that { HEAD ~ adjustment } to various head sizes may be effected by { TAIL ~ means } of the placement of the ends of the strap 20A on the mating fastener portions 20B and 20C
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH