Either you are sitting, standing, working, sleeping or relaxing; your back spine is most comfortable in what is called a neutral posture. The neutral posture is a position about halfway between full bending and arching.
Your neutral back spine has three natural curves: the inward curve at the neck (cervical lordosis), the outward curve at the upper back (thoracic kyphosis), and finally the inward curve at the low back (lumbar lordosis).
The neutral spinal curves differ in shape from person to person. Neutral spinal curves can change for the better with exercise and training; And sometimes for the worse with injury, aging, poor posture habits or a disease.
The amount of curving in your spine when you are in a neutral posture determines your support needs. A spinal support product should be deep enough to support your particular curves without pushing beyond your neutral postures. Meaning it should feel natural and not too arched; you should also feel supported; meaning there must not be a gap between you and the support.
Time and again some people still have back pain while sitting with a back support. That is...