An active bolster for passenger crash protection in a vehicle comprises a base wall and a front wall, the walls having first and second facing surfaces to form an inflatable bladder with an initial open space between the surfaces. The bladder includes a plurality of tear joints. Each tear joint is comprised of first and second upstanding ribs wherein the first upstanding rib extends from the first surface part way into the open space and extends end-to-end along a first direction. The second upstanding rib extends from the second surface part way into the open space to contact the first upstanding rib and extends end-to-end substantially along a second direction that is substantially transverse to the first direction so that the first and second upstanding ribs contact at an intersection. At each intersection the first and second upstanding ribs comprise a welded joint that is substantially rigid against compression forces and that allows the tear joints to separate under tension during inflation of the bladder.