The extensions 20B and 20C each comprise the other half of a hook and loop fastener; so that {HEAD ~ adjustment} to {TAIL ~ 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 
to
The extensions 20B and 20C each comprise the other half of a hook and loop fastener ; so that { HEAD ~ adjustment } to { TAIL ~ 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
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