A vehicle seat is provided, in at least one embodiment, comprising a seatback comprising a cushion having a first hardness, and a pneumatic thoracic support structure positioned adjacent the cushion. In at least one embodiment, the pneumatic thoracic support structure comprises a first bladder selectively inflatable to provide a first area having a second hardness higher than the first hardness, with the first area being disposed along a thoracic region of a user's spine when a user is seated in the seat to provide support to at least a portion of the thoracic region of the user's spine.