This upgrade provides lumbar and side support in the back cushion. It is available on all TR models, all ST models (except ST18), and all NT models (except NT14 & NT16). There are two color options: black with camo inset and black with black inset. The base cushion will match the color that is chosen for the seat back. **Please note – this is the cost to upgrade cushions at the “factory build” stage, not the cost to purchase these cushions separately.