Good posture helps to reduce the stress placed on your spine. Your neutral position, also known as perfect posture, is the position that causes the least amount of stress on your spine.
However, most office chairs and car seats only offer fixed lumbar support. Lifted Lumbar is different, because it allows you to adjust your lumbar support to your neutral spine position.
Additionally, when you sit on the cushion, you experience a "hugging" sensation that improves blood flow to your legs and promotes better posture in the lumbar region.