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Pillows used while sitting or lying down that are shaped to conform to the natural curvature of the lower back, which promotes correct posture and prevents or relieves lower back pain and fatigue. They can be shaped like a long, narrow roll or can be larger to fit the entire back of a chair, with a base that curves out or inflates to support the lumbar region of the back. There are also fully inflatable, gel-filled, and water-filled lumbar pillows.
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