The BACKBONE seat cushion supports the spine from the middle instead of the low back. This effortlessly engages your core muscles so that your head, shoulders, and hips are aligned. Unique, patented THORACIC groove technology disperses pressure away from the spine and increases the firing of your core muscles to strengthen as you sit. Its closed-cell, therapeutic foam is specifically contoured and shaped to support the curves of the spine without blocking the shoulder blades or pushing you forward out of alignment.