This upgrade provides lumbar and side support in the back cushion. It is available on all TR models, all ST models (except ST16 & ST18), and all NT models (except NT14 & NT16). There are three color options: black with camo inset, black with digital camo inset, and black with black inset. The base cushion will match the color that is chosen for the seat back.
Trackchair NT, Trackchair ST, Trackstander TR