in the following figures , the same reference numerals will be used to refer to the same components . in the following description , various operating parameters and components are described for different constructed embodiments . these specific parameters and components are included as examples and are not meant to be limiting . with reference to fig1 , a view of a door trim substrate 10 is shown from the outboard side of the vehicle , looking inboard . integral to the door trim substrate 10 is a set of energy absorbing features 12 , a storage pocket 14 , a storage pocket wall 16 , and a storage pocket extension 18 . in the preferred embodiment the energy absorbing features include various rib elements , generally illustrated as a first generally vertical rib 20 , a second generally vertical rib 22 , a third generally vertical rib 24 , a first generally horizontal rib 26 , and a second generally horizontal rib 28 . the rib 24 and the rib 28 are shown having shapes as compared to the other rib elements in order to increase the lateral stiffness of the door trim system at those locations . an occupant &# 39 ; s seating position is generally predictive of that occupant &# 39 ; s size , which is generally predictive of the occupant &# 39 ; s resistance to lateral injuries . the rib structure is shown for illustrative purposes only and is not intended as being limiting . with reference to fig2 , a sectional view of the door trim system , generally illustrated as 30 , is shown prior to occupant contact . the door trim system 30 includes a door inner sheetmetal 32 , a door trim substrate 34 , and a door trim finish panel 36 . integrally molded into the door trim substrate 34 is a storage pocket extension 38 and an energy absorbing rib 40 . in this illustration , any potential appearance concerns are masked by the additional door trim finish panel . other embodiments may remove the finish panel and cover the door trim substrate with a vinyl or other material . the occupant &# 39 ; s pelvis 42 is shown prior to contact with the door trim system . with reference to fig3 , the door trim system 30 is shown following occupant contact . the door trim system 30 is composed of several parts , including the door inner sheetmetal 32 , the door trim substrate 34 , and the door trim finish panel 36 . integrally - molded into the door trim substrate are two additional features , including the storage pocket extension 38 and the energy absorbing ribs 40 . as shown , the occupant &# 39 ; s pelvis 42 is interacting with the door trim system 30 . as the occupant &# 39 ; s pelvis 42 continues to move relative to the door trim system 30 , the energy absorbing rib 40 deforms . it is this deformation along with the deformation of the surrounding door trim substrate 34 and the door trim finish panel 36 that absorb substantial levels of crash energy . with reference to fig4 , a view of a door assembly , generally illustrated as 50 , is shown from the inside of the vehicle . the door assembly 50 is of the standard type and it is to be understood that different configurations of the door are envisioned within the scope of the present invention . the door assembly 50 includes an outer panel ( or skin ) 52 , an interior panel 54 , an armrest and grab handle assembly 56 , a map pocket 58 , and a pelvic bolster 60 . it is also to be understood that the general configuration of the interior panel 54 and the particular configurations of the armrest and grab handle assembly 56 , the map pocket 58 , and the pelvic bolster 60 are shown for illustrative purposes only and are not intended as being limiting . particularly , the armrest and grab handle assembly 56 , the map pocket 58 , and the pelvic bolster 60 could be configured differently in terms of shape , size and overall configuration . in fig5 and fig6 the interior panel 54 of the door assembly 50 has been removed , revealing a door substrate 70 . as is known in the art , the door substrate 70 includes a variety of supporting structures , including , for example , a first armrest support structure 72 and a second armrest support structure 74 . it is to be understood that any of a great variety of support structures may be provided in a variety of different configurations . a door pocket closeout 76 is formed on the door substrate 70 as is known in the art . adjacent the door pocket closeout 76 is a pelvic bolster support structure 80 . the pelvic bolster support structure 80 may also be of a variety of shapes and sizes and it is to be understood that the placement , size and shape of the pelvic bolster support structure 80 illustrated in fig5 and fig6 is for demonstrative purposes only . according to one of the objectives of the disclosed invention , the pelvic bolster support structure 80 is formed integrally with the door substrate 70 such that , collectively , the pelvic bolster support structure and the door substrate are one and the same piece . this simplifies manufacturing and assembly . to provide the pelvic bolster support structure 80 with the requisite impact - responsive characteristics the pelvic bolster support structure 80 is formed from a series of relatively thin walls that collapse , fold and in some instances tear in a relatively controlled , non - random way . a better understanding of this arrangement may be established by reference to fig7 through fig1 in which the pelvic bolster support structure 80 is first illustrated , in fig7 , in its pre - impact state . in fig8 through fig1 the pelvic bolster support structure 80 is illustrated in different stages of an impact event , with fig8 illustrating the pelvic bolster support structure 80 early in an impact event , fig9 illustrating the pelvic bolster support structure 80 mid - way through an impact event , and fig1 illustrating the pelvic bolster support structure 80 at the last stage of the impact . with reference to fig7 , the pelvic bolster support structure 80 is shown in detail . it is to be understood that the pelvic bolster support structure 80 is an integral part of the door substrate 70 in all of these views . it is also to be understood that the illustrated pelvic bolster support structure is shown in one of many possible arrangements , and thus the illustrated configuration and its related description are provided for non - limiting illustrative and explanatory purposes . the pelvic bolster support structure 80 includes an upper wall 82 , a lower wall 84 , a first side wall 86 , and a second side wall 88 . the walls 82 , 84 , 86 , and 88 may be modified and adapted as needed to fit within a prescribed area . within the outer structure defined by the walls 82 , 84 , 86 , and 88 are a pair of substantially vertical walls 100 and 100 ′ and a pair of substantially horizontal walls 102 and 102 ′. a greater or lesser number of vertical and horizontal walls may be provided . the vertical walls 100 and 100 ′ and the horizontal walls 102 and 102 ′ may be formed in a variety of ways . as illustrated , each of these walls is formed to define a recessed area . along the upper wall 82 is preferably provided a plurality of flanges 90 , 90 ′, 90 ″ and 90 ′″. along the lower wall 84 is also preferably provided a plurality of flanges 94 , 94 ′, and 94 ″. similarly , along the first side wall 86 is preferably provided a plurality of flanges 96 , 96 ′, 96 ″, and 96 ′″ and along the second side wall 88 is preferably provided a plurality of flanges 98 , 98 ′, 98 ″, and 98 ′″. all of the flanges are angled away from the pelvic bolster support structure 80 . a greater or lesser number of flanges may be provided and the flanges may be of a shape , configuration , and placement other than that as shown . of course , the flanges themselves may not be provided . with reference to fig8 , the pelvic bolster support structure 80 is shown in the earliest stage of an impact event . the flanges 90 , 90 ′, 90 ″ and 90 ′″ on the upper wall 82 , the flanges 94 , 94 ′, and 94 ″ on the lower wall 84 , the flanges 96 , 96 ′, 96 ″, and 96 ′″ on the first side wall 86 and the flanges 98 , 98 ′, 98 ″, and 98 ′″ on the second side wall 88 have all begun to be pressed downward and outward , as have the walls 82 , 84 , 86 and 88 . this outward motion causes a tearing condition at the seams between the walls 82 , 84 , 86 and 88 , for example , at seams 104 , 106 and 108 . in addition , the vertical walls 100 and 100 ′ and the horizontal walls 102 and 102 ′ are also beginning to bend . as the deflection increases , as illustrated in fig9 and 12 , the vehicle occupant ( not shown ) would contact more and more material to insure that the load increases . as the impact event proceeds as illustrated in fig9 , which is about half way through the event , and fig1 , which is at the end of the event , the walls 82 , 84 , 86 , and 88 continue to bend outwardly , substantially like a rose petal . the tearing of the seams , such as the seams 104 , 106 , and 108 , also continues . the walls of the pelvic bolster support structure 80 are preferably formed from a thin polymerized material which substantially enables energy absorption . ( if the walls were thick then the pelvic bolster support structure 80 would tend to fracture . conversely , thin walls bend and provide a more continuous loading curve .) the pelvic bolster support structure 80 works in an impact event because it relies upon relatively thin load - bearing walls in combination with the designed - in outward bending of the walls as guided by the flanges . this arrangement creates a loading curve which is more continuous than those known . the thickness , placement , and arrangement of all of the walls 82 , 84 , 86 , 88 , 100 , 100 ′, 102 and 102 ′ can be modified or tuned as needed to provide maximum results . while the pelvic bolster support structure of fig5 through 12 provide an approach to providing the desired integrated pelvic bolster and door substrate , other arrangements are possible and are provided in fig1 and 12 . with reference first to fig1 , a pelvic bolster support structure 110 is illustrated and is formed integral with a door substrate 70 ′. the pelvic bolster support structure 150 is composed of a plurality of pyramid - like structures having a base 112 that is integrally formed with the door substrate 70 ′ and a top 114 . as illustrated , the base 112 is wider than the top 114 . the thickness , size , shape , arrangement , and number of the pyramid - like structures may be modified as required to achieve the desired results . with reference next to fig1 , a pelvic bolster support structure 120 is illustrated and is formed integral with a door substrate 70 ″. the pelvic bolster support structure 120 is composed of a plurality of pyramid - like structures having a base section 122 that is integrally formed with the door substrate 70 ″ and a top section 124 . as illustrated , the base section 122 is wider at its lower end than at its top end . similarly , the top section 124 is wider at its lower end than at its top end . as with the pelvic bolster support structure 110 of fig1 , the thickness , size , shape , arrangement , and number of the pyramid - like structures may be modified as required to achieve the desired results . in addition , a greater number of sections may be added . furthermore , some structures may have a greater or lesser number of sections than adjacent or other structures . the foregoing discussion discloses and describes exemplary embodiments of the present invention . one skilled in the art will readily recognize from such discussion , and from the accompanying drawings and claims that various changes , modifications and variations can be made therein without departing from the true spirit and fair scope of the invention as defined by the following claims .