Hinged for use in reclining chairs. Closed-cell foam support can be modified with an electric knife (item #5500-00). Fits either left or right; on both sides or individually. Optional hook-and-loop attachment straps (sold separately) fasten around the back of geri chair for additional security. Optional torso support made from open-cell foam fastens to side support with hook & loop material. Sold individually. (Patent Patterson Medical)