A vehicle seat and an airbag system, the seat comprising a backrest and a squab, which extends from the backrest in a longitudinal direction, the backrest extending in height from the squab at a first lower position to a second upper position of the seat that is arranged proximal shoulders of an occupant in a seated position, the airbag system comprising an airbag to receive inflating gas from an inflator to inflate the airbag from a deflated configuration to an inflated configuration, in which the airbag includes an upper region that extends over a head of the occupant in said seated position and a lower region that extends over a mid-section of the occupant in said seated position, wherein the airbag system comprises a tether system interconnecting the seat at the second upper position of the seat and the airbag to restrain the lower region of the airbag in the inflated configuration in the longitudinal direction, characterised in that, with the airbag in the inflated configuration, the tether system includes a first tether extending in the longitudinal and lateral directions and around the mid-section of the occupant, from the first side of the backrest, and the tether system includes a second tether extending in the longitudinal and lateral directions and around the mid-section of the occupant, from the second side of the backrest, wherein the first and second tether (56, 58) overlap each other between the first and second side (16, 18). the seat comprising a backrest and a squab, which extends from the backrest in a longitudinal direction, the backrest extending in height from the squab at a first lower position to a second upper position of the seat that is arranged proximal shoulders of an occupant in a seated position, the airbag system comprising an airbag to receive inflating gas from an inflator to inflate the airbag from a deflated configuration to an inflated configuration, in which the airbag includes an upper region that extends over a head of the occupant in said seated position and a lower region that extends over a mid-section of the occupant in said seated position, wherein the airbag system comprises a tether system interconnecting the seat at the second upper position of the seat and the airbag to restrain the lower region of the airbag in the inflated configuration in the longitudinal direction, characterised in that, with the airbag in the inflated configuration, the tether system includes a first tether extending in the longitudinal and lateral directions and around the mid-section of the occupant, from the first side of the backrest, and the tether system includes a second tether extending in the longitudinal and lateral directions and around the mid-section of the occupant, from the second side of the backrest, the tether system includes a first tether extending in the longitudinal and lateral directions and around the mid-section of the occupant, from the first side of the backrest, and the tether system includes a second tether extending in the longitudinal and lateral directions and around the mid-section of the occupant, from the second side of the backrest, wherein the first and second tether (56, 58) overlap each other between the first and second side (16, 18).