The backplate supports allow for additional trunk support. Whether the user tends to lean forward, or backward, the backplate supports can aid in improving posture and remaining upright. 
 
The lower and upper backplate supports can be installed individually, or together.
 
The lower backplate support is commonly used in cases where the user tends to lean forward, or allow their legs to drag. This support pushes their body into an upright position.
 
The upper backplate support is commonly used in cases where the user tends to lean backward. This support pushes their body into an upright position.