The Width Adjustable Lateral Pads are shown attached to the Optional Pelvic Pad. They measure 5" d x 3.5" h. The Lateral Pads adjust in width from 6" to 9" on the small pelvic pad and 8" to 11.5" on the large pelvic pad. The Lateral Pads prevent excessive pelvic movement to the right and left. Please note: Lateral Pads attach to Pelvic Pad. Therefore, you must also order a Pelvic Pad #SS-4010 OR #SS-4011 to use Lateral Pads.