Under mattress bed wedge that elevates the head of the bed to help reduce or eliminate night time acid reflux burning from Acid Reflux, GERD, Heartburn, Acid Indigestion, Barrett's Esophagus, Hiatal Hernia, Post Nasal Drip, Sinus Congestion, Snoring and more. Five inch elevation at top. Made with high grade polyurethane foam that is no slip. Effectiveness clinically proven. Used for three weeks. Half of what we paid.