Embrace AIR Plus was designed with the help of Chiropractors and Physiotherapists and scientific proof. This patented design lets you determine the firmness of the support AND its exact position. Most importantly you can easily change the firmness with the push-button valve and easy squeeze bulb. It creates changes in weight distribution and circulation patterns within the back. (see demo on right) Important to you for the prevention of back pain and damage that may be caused by extended (over 20 minutes) sitting. Get well and stay well.