Backjoy Relief Black Maintain your vitality by sitting with BackJoy Relief Its patented design encourages optimal posture and engages core muscles so you can sit more comfortably, and correctly, to get more out of life. Relief is not a simple cushion. It contains APS Technology and Advanced Core Materials. It was designed so you can automatically sit with optimal sitting posture, anytime, anywhere. And with the impact absorbing, all-conditions skin you can sit from the office chair to a rock hard surface with greater comfort, longer. Here is how it works: 1) Our patented Applied Postural Science (APS) corrects your posture You know that you are supposed to sit better, but it's hard. Our APS Technology automatically tilts, cups, and floats your pelvis upright so you can find your most balanced and comfortable posture. 2) Relief naturally maintains your posture while you sit You move when you sit " so Posture+ moves with you - freeing your pelvis to actively stabilize your spine.