An inflatable airbag assembly, comprising: an inflatable airbag; an inflatable airbag housing coupled to the inflatable airbag; a mounting member (170, 270) attached to the airbag housing; a tether release assembly (150, 250) that is reversibly coupled to the mounting member (170, 270); and a tether (120, 220) reversibly coupled to the tether release assembly (150, 250); wherein, when the tether release assembly (150, 250) becomes uncoupled from the mounting member (170, 270), the tether (120, 220) becomes uncoupled from the tether release assembly (150, 250) such that the tether (120, 220) is released, characterized in that the tether release assembly (150, 250) comprises a pyrotechnic squib (156, 256) and a piston (151, 251) being located within an interior chamber (157, 257) of the tether release assembly (150, 250), and wherein the pyrotechnic squib (156, 256), upon activation, causes the piston (151, 251) to act on the mounting member (170, 270) to uncouple the tether release assembly (150, 250) from the mounting member (170, 270), and the mounting member (170, 270) comprises an open end (172, 272) and a closed end (174, 274), and wherein a post (175, 275) is located within the mounting member (170, 270) at the closed end (174, 274), wherein, upon activation, the pyrotechnic squib (156, 256) generates heat and gas, which act on the piston (151, 251) and causes the piston (151, 252) to push against the post (175, 275) within the mounting member (170, 270), such that the tether release assembly (150, 250) slides away from the closed end (174, 274) of the mounting member (170, 270), thereby allowing the tether release assembly (150, 250) to become uncoupled from the mounting member (170, 270). an inflatable airbag; an inflatable airbag housing coupled to the inflatable airbag; a mounting member (170, 270) attached to the airbag housing; a tether release assembly (150, 250) that is reversibly coupled to the mounting member (170, 270); and a tether (120, 220) reversibly coupled to the tether release assembly (150, 250); wherein, when the tether release assembly (150, 250) becomes uncoupled from the mounting member (170, 270), the tether (120, 220) becomes uncoupled from the tether release assembly (150, 250) such that the tether (120, 220) is released, characterized in that the tether release assembly (150, 250) comprises a pyrotechnic squib (156, 256) and a piston (151, 251) being located within an interior chamber (157, 257) of the tether release assembly (150, 250), and wherein the pyrotechnic squib (156, 256), upon activation, causes the piston (151, 251) to act on the mounting member (170, 270) to uncouple the tether release assembly (150, 250) from the mounting member (170, 270), and the mounting member (170, 270) comprises an open end (172, 272) and a closed end (174, 274), and wherein a post (175, 275) is located within the mounting member (170, 270) at the closed end (174, 274), wherein, upon activation, the pyrotechnic squib (156, 256) generates heat and gas, which act on the piston (151, 251) and causes the piston (151, 252) to push against the post (175, 275) within the mounting member (170, 270), such that the tether release assembly (150, 250) slides away from the closed end (174, 274) of the mounting member (170, 270), thereby allowing the tether release assembly (150, 250) to become uncoupled from the mounting member (170, 270).