Ergonomic Yaman Pelvic Correction Cushion. - Color: Brown - Design: Ergonomic shape - Use: Pelvic correction cushion Simply sit with the flat side against your back and your legs straddling it to adjust your pelvic position correctly. Also, rocking it back and forth can train your abdominal muscles, which is effective for a protruding belly. Please note that this is a used item. There are no noticeable stains!