When you sleep on your stomach, your primary concern is the position of your back (spine). Too much softness for a stomach sleeper results in an arched back (poor posture) and may cause back pain. We have most of our weight in the center third of our bodies, so there is a natural tendency to 'sag' in the middle. Firmer padding on top of the mattress helps to keep our posture (spine position) correct.

A Pillowtop mattress has many layers of soft padding that can compromise the posture of a stomach sleeper. The contouring comfort that is essential for a side sleeper can be a source of pain and discomfort for a stomach sleeper because the mattress "gives" to much.