Correcting or accommodating for a wide variety of pelvic and postural abnormalities. This system allows for on-site customization of an off-the-shelf cushion to effectively meet the needs of any user. The ATI is constructed of a strong aluminum that is designed to be molded to provide additional support where needed. The insert fits under cushion, inside the cover, and can also be remolded to meet changes in the user’s physical and functional needs. This dynamic nature provides long-term positioning support while allowing for movement where possible.