This amazing back support lets your spine relax naturally upright. You get stress-free sitting posture. And, it actually helps prevent back pain. A simple fingertip knob provides support where you need it most. Each person gains pelvis support, base-of-the-spine support along with upper back & neck comfort. This patented support system is used by: NASA, Porsche®, BMW®, Lancia®, Cadillac®.