A single coronal MRI slice was acquired from a male subject to generate a 4 mm thick anatomically realistic geometrical model of the left buttock. The subject was scanned using a non-weight bearing configuration and then a full weight-bearing on a semi-rigid support. The data was imported to ScanIP to segment the MRI image (864 x 608 pixels) into tissue components representing the IT bone, the gluteus maximus skeletal muscle, fat tissue and skin, and either a flat foam cushion or an ACB cushion. The slice was also uniformly extruded to a 4-mm depth, representing the MRI resolution in the Z axis. Fifteen model variants were created incorporating a range of anatomical adaptations, and were tested using two flat foam cushion and an ACB cushion.