The present invention relates to a fastener (1) comprising a band (2) and a holding member (8). The band (2) having a first end (3) and a second end (4), and an inwardly facing surface (5) and an outwardly facing surface (6) extending therebetween. Teeth (7) are provided on the inwardly facing surface (5) and outwardly facing surface (6) at least the first (3) and second (4) ends of the band (2). A holding member (8) for holding the band (2) in a closed loop such that the holding member (8) is arranged to engage the teeth (7) provided by the inwardly facing surface (5) or the outwardly facing surface (6) at least the first end (3) of the band (2) with the teeth (7) provided by the outwardly facing surface (6) or the inwardly facing surface (5) respectively at least the second end (4) of the band (2).