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