A plywood cover plate for the back rest of the largest R82 x:panda seat. It mounts into the slot in the back and closes the gap beneath the back rest, giving a firm continuous surface across the lower back.
For a bigger, heavier user, that firmness is the point. A rigid plate resists the loads that a teenager or young adult puts through the lumbar area when they push back, which helps hold the pelvis in the position you have set rather than letting it drift into the gap.
It goes in behind the cushion and is not visible once the chair is made up.






