The invention relates to a webbing strap device (3) of adjustable length, comprising an adjusting belt anchor (4), an adjusting loop anchor (5) having an adjusting loop eyelet (25), a ladder-like slide member (6) having a first frame crossbar (8), a second frame crossbar (9) spaced apart from the first frame crossbar (8) and at least two intermediate crossbars (10) arranged between the first frame crossbar (8) and the second frame crossbar (9), and a webbing strap (7) fastened to the first frame crossbar (8) and the adjusting strap anchor (4). The webbing strap (7) extends between the at least two intermediate crossbars (10) through the slider (6) to form an adjusting loop (24). In the region of the adjusting loop (24) the webbing strap (7) extends through the adjusting loop eyelet (25).
