Vehicle side door bolster

A vehicle side door assembly, comprising:

• a first beam;
• a second beam;
• and
• a bolster spanning from the first beam to the second beam, the bolster directly attached to both the first beam and the second beam using a plurality of mechanical fasteners that extend through the bolster to engage the first beam or the second beam,
• wherein the bolster has an inboard side having an array of inboard pockets and an outboard side having an array of outboard pockets,
• wherein the array of inboard pockets is a first array of inboard pockets within a first bolster section and the array of outboard pockets is a first array of outboard pockets within the first bolster section, and further comprising a second array of inboard pockets within a second bolster section and a second array of outboard pockets within the second bolster section, the first bolster section spaced a distance from the second bolster section,
• wherein first and second grids of inboard ribs respectively define the first and second arrays of inboard pockets, wherein first and second grids of outboard ribs define the first and second arrays of outboard pockets, and further comprising a connecting arm that connects the first bolster section to the second bolster section, the connecting arm lacking rib-defined cavities.