flanges 13 and 15 these are generally rectangular of double thickness with preferably round upper corners 14 and lower corners 16 see fig1 disposed just below said head flanges and also extending outwardly on either side of said center portion 12 are the neck collar members 17 and 19 fold lines 33 and 35 form the interior edge of both head flanges while the hard neck collar members 17 and 19 have fold lines designated 33 39 and 35 39 intermediate vertical fold lines 81 and 82 are spaced substantially equidistant from the outer vertical edge of each head flange and the respective interior fold lines 33 and 35 optionally a throughbore 83 84 may be made in the head flange of about 1 34 diameter spaced up about 4 34 on the first inwardly intermediate fold line 81 and 82 these throughbores serve as a guide means for sound directed to the ears of the patient such that when the head flange is positioned as shown in fig7 the patient can still hear slots 18 and 20 usually about 1 2 34 in elevation are cut through to isolate the bottom edge of each head flange from its adjacent collar member the hard collar members 17 and 19 comprise generally outwardly extending mirror image 90 u00b0 inwardly inverted boot like portions secured to or integrally formed with central member 11 39 these include vertical fold lines 71 and 72 portions 17 and 19 each.