The seat cushion includes a non-slip design on the bottom so that it does not move once placed on a seat. The bottom of the cushion is also made with a skid resistant design so that the cushion will not move once placed on a chair Relieves Hip Pressure &Back Pain: Lumbar pillow with ergonomic curve, in line with the physical characteristics of adults, seat cushion ergonomic U-shaped design, a perfect fit for the curve of the hip.