A wedge seat cushion is a triangular-shaped pillow to keep your body raised from the surface. It is often recommended for people who are recovering from surgeries to support their joints and reduce swelling or pain. These pillows can be used while sitting, lying down, or sleeping. The wedge set cushions are popularly used for health issues like back pain, acid reflux, sleep apnea, hip pain, etc. The wedge pillows support your back and neck and relieve pressure from your muscles.