Flip down horizontal support and slide firmly into crack of seat until back of support meets the back of seat.
Pad- Hand wash in warm water with mild soap. Rinse thoroughly. Air dry at room temperature. Frame- clean with water and mild detergent.
Adult use only- not for use with children. This product is not a safety device or a substitute for medical care. Always consult a doctor or medical professional for diagnosis and treatment of any pain or injury. Inspect the support before each use. Discontinue use if any part of the back support is broken or damaged. Do not attempt repair.
You might want to take a closer look.