The adjustable strap 308 in the rear is used to adjust {TAIL ~ the headset} to {HEAD ~ a comfortable tension} setting for many different head sizes 
The adjustable strap 308 in the rear is used to adjust { TAIL ~ the headset } to { HEAD ~ a comfortable tension } setting for many different head sizes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH