It is a positioning foam wedge that creates an inclined sleep surface. It is typically placed on top of the mattress and it is used to create an optimal angle for the torso, neck, and head to provide relief for individuals with acid reflux or gastroesophageal reflux disease (GERD). One advantage of a positioning wedge over an acid reflux foundation is that it can be used by one person while the partner can sleep on a flat surface. This solution is not recommended for those with lower back or hip injuries which will find it difficult to tolerate the inclined angle.