The Support Kit for the First Class School Chair provides full support and extra security while using the chair. An adjustable trunk harness focuses support on the sternum and rib cage to prevent forward slumping and maintain correct midline seated position. Depth adjustable abductors position the users knees and help control spasti muscles that can cause legs to cross. Lateral supports that are height and width adjustable help to align and stabilize the upper body. Support Kit includes Trunk Harness, Abduction, and Lateral Supports|Adjustable and zippered trunk harness provides focused support on the sternum and rib cage|Semi-stretch material allows controlled movement, prevents forward slumping and also maitains correct midline seated position|Straps with cam lock buckles secure the trunk harness|Abductor is depth adjustable; Positions user's knees and controls spastic muscles that might cause their legs to cross|Lateral supports assist proper stabilization and alignment of the upper body|Lateral supports are height and width adjustable