By contours to your body, the material supports key pressure points and promotes blood flow, effectively easing discomfort and tiredness during prolonged sitting or lyingErgonomic Lumbar Support Cushion - The raised middle, depressed side and extended edge perfectly contours to the body, fills the gap between the waist and the bed, fit the curve of the lumbar spine, and effectively relieve the pain caused by the waist, thereby reducing the burden on the back.