Whether you are standing, sitting, sleeping, working, or relaxing, your spine is most comfortable in what we call a neutral posture. Neutral postures are positions about halfway between full bending and arching.

Your neutral spine has three natural curves: an inward curve at the neck (cervical lordosis), an outward curve at the upper back (thoracic kyphosis), and an inward curve at the low back (lumbar lordosis).

Neutral spinal curves vary in shape from person to person. They can also change - sometimes for better, with exercise and training; sometimes for worse, with aging, injury, disease, or poor posture habits.

The amount of curvature in your spine when you are in a neutral posture determines your support requirements. A spinal support's curves should be deep enough to support your particular curves without pushing beyond your neutral postures. It should feel natural. You should not feel too arched; nor should you feel unsupported, as though there were a gap between you and the support.