A hair fastener in the form of a hair claw comprising a first claw member, a second claw member and an elongate block, wherein: - each of the first and second claws (4, 6) is provided with a front portion (10c, 12c), a rear portion (10a, 12a) and a joint portion arranged in between, the rear portions of the first and second claw members acting as a pair of handles for controlling opening or closure of the hair fastener, - the elongate block is positioned between the first and second claw members (4, 6) at the joint portions thus acting as a hinge at which the first and second claw members are pivotably and reciprocatingly movable with respect to each other, - the elongate block is made of essentially polymeric materials and provided with a front region and a rear region, - the front region includes a plurality of tension cables, and a clearance is provided between the tension cables and the rear region such that the tension cables and the rear region can operate independently of each other, - the elongate block is adapted to assume a first configuration in which as the handles are moved towards each other the rear region is compressed and the tension cables are stretched, and a second configuration in which as the handles are released the tension cables pull the first and second claw members (4, 6) towards each other thus returning the hair fastener to a closed or default state, and - each of the joint portions of the claw members (4, 6) is provided with an opening (16a, 16b) defining a rim (18a, 18b), and the elongate block is provided with an upper circumferential groove and a lower circumferential groove formed at opposite ends thereof, and the elongate block fixedly connects to the first and second claw members (4, 6) with the grooves (20a, 20b) engaged to the rims (18a, 18b). - each of the first and second claws (4, 6) is provided with a front portion (10c, 12c), a rear portion (10a, 12a) and a joint portion arranged in between, the rear portions of the first and second claw members acting as a pair of handles for controlling opening or closure of the hair fastener, - the elongate block is positioned between the first and second claw members (4, 6) at the joint portions thus acting as a hinge at which the first and second claw members are pivotably and reciprocatingly movable with respect to each other, - the elongate block is made of essentially polymeric materials and provided with a front region and a rear region, - the front region includes a plurality of tension cables, and a clearance is provided between the tension cables and the rear region such that the tension cables and the rear region can operate independently of each other, - the elongate block is adapted to assume a first configuration in which as the handles are moved towards each other the rear region is compressed and the tension cables are stretched, and a second configuration in which as the handles are released the tension cables pull the first and second claw members (4, 6) towards each other thus returning the hair fastener to a closed or default state, and - each of the joint portions of the claw members (4, 6) is provided with an opening (16a, 16b) defining a rim (18a, 18b), and the elongate block is provided with an upper circumferential groove and a lower circumferential groove formed at opposite ends thereof, and the elongate block fixedly connects to the first and second claw members (4, 6) with the grooves (20a, 20b) engaged to the rims (18a, 18b).