We describe neutral spinal curves in terms of a size: flat, average, and deep. Most people have average spinal curves. In our catalog you will find symbols near each product to indicate the spinal contour size each product supports.
Unless you know for certain that you have a deep curve (if you can't live without your lumbar roll) or flat curve (if you like the feel of your straight-backed chair), play the averages. Of course, the only way to be certain that a product is right for you is to try it.