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 substantially parallel tether yarns extending in a length-direction across at least a region of the airbag and passing between the layers within the inflatable chamber, wherein:
• said first layer comprising a plurality of spaced-apart first connection regions within which tether yarns selected from said plurality of tether yarns are implicated in the structure of said first layer;
• and said second layer comprising a grid-like arrangement of second connection regions within which tether yarns selected from said plurality of tether yarns are implicated in the structure of said second layer;
• said grid-like arrangement of second connection regions dividing at least a region of said second layer into an array of sectors;
• wherein said first connection regions are offset relative to said second connection regions such that each said first connection region of the first layer is located opposite a respective said sector of the second layer and does not oppose any said second connection region across the inflatable chamber;
• and
• wherein said first connection regions are each wider than said second connection regions in the length-direction of said tether yarns, said tether yarns thereby serving to induce double curvature to the airbag when the inflatable chamber is inflated.