An airbag

An airbag configured to be inflated by a source of gas, the airbag being formed from first and second layers of fabric arranged in superimposition to define an inflatable chamber between the layers for the receipt of inflating gas;

• each layer of fabric having a structure comprising at least one yarn, and the two layers being interconnected by a plurality of tether yarns extending between the layers within the inflatable chamber, wherein:
• at least some of said tether yarns are implicated in the structure of said layers within a first group of connection regions comprising a plurality of first connection regions within which the tether yarns are implicated in the structure of the first layer, and a plurality of second connection regions within which the tether yarns are implicated in the structure of the second layer;
• and at least some of said tether yarns are implicated in the structure of said layers at a second group of connection regions comprising a plurality of first connection regions within which the tether yarns are implicated in the structure of the first layer, and a plurality of second connection regions within which the tether yarns are implicated in the structure of the second layer;
• wherein within each said group of connection regions:
• i) each said first connection region is wider in a length-direction of the tether yarns than each said second connection region, and ii) said second connection regions are offset relative to said first connection regions such that said second connection regions do not oppose any said first connection regions across the inflatable chamber;
• and wherein said first and second connection regions within each group are elongate and extend generally parallel to one another and across respective layers of the airbag, the connection regions of the first group being non-parallel to the connection regions of the second group;
• the tether yarns serving to induce a first curvature to the airbag via the first group of connection regions, and to induce a second curvature to the airbag via the second group of connection regions, when the inflatable chamber is inflated.