Invacare TDX SP User Manual page 59

• Pull the inner cushion out.
The inner cushion comprises five individual compartments
filled with air-filled tetrahedrons (1). These can be added,
removed or redistributed in the different compartments to
adjust hardness and positioning.
• To access the inner compartments, open the zipper.
• Adjust the cushion by adding or removing air-filled
tetrahedrons from the individual compartments, until the
cushion has the desired hardness and shape.
• Close the inner cushion again.
• Place the inner cushion back in it's cover again and zip
shut.
• Reposition the cushion on the backrest board, and press
firmly onto the Velcro fastening material.
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