Stomach sleepers on a 'firm' surface mattress compress the sleep surface the least. A firmer pillow is best for those who select a firm sleep surface so that the head is properly supported.
Firm Down Pillows
Stomach sleepers who select a ‘medium’ surface mattress do compress the sleeping surface a fair amount. For proper head support, a medium pillow is recommended.
Medium Down Pillows
A soft pillow provides ideal head support to stomach sleepers who choose a ‘soft’ surface mattress. These individuals compress the sleeping surface the most.
Soft Down Pillows