Sit Up Cushion

*Arch design naturally curves to the back,
  allowing for more effective core
  while protecting your lower back.
*Great for those with lower back pain problems
  who want a safe way to continue
  strengthening their abdominal muscles.
*The height can be adjusted by inflating the air into
  the cushion,durable material gives comfort
  and the perfect amount of firm support for
  your back and spine.
*Available for seat cushion purpose.