Abstract: There is disclosed a golf instruction aid which is readily adjustable to permit the stiffening support of the leading arm to be released between strokes for the greater convenience and comfort of the golfer. The device is comprised of a flexible sleeve; a tensioning strip attached to and depending from the sleeve, the width of the strip being substantially the same as the length of the sleeve, the strip having a first side, a second side and an end remote from the sleeve; a first fastener disposed on the first side of the strip at the remote end; and a second fastener disposed at a point on the second side of the strip, whereby the strip may be wrapped around the sleeve and maintained in tension by securing the first fastener to the second fastener.