You need a cushion...but perhaps not one that's 4 inches thick?
Try this one. It's 3" thick, and measures 16" x 18".
These great cushions are not just for wheelchairs!
Anyone who sits for extended periods of time can experience the comfort that this cushion provides.
This cushion is 3 inches thick, and comes in plaid, navy or black.
The cover is removable and fully washable.
Foam meets CAL #117 requirements.