The unique design of the Sissel ® supportive neck pillow has proven itself time and again over its 30-year history. Cast in one piece from polyurethane foam for dimensional stability, it offers active support and correction of the spine. The key difference is the bevel or lip which supports the neck in the side position, alleviating pressure on the vertebrae and discs. It can take up to 2 weeks to adjust to, but users report relaxed peaceful sleep with accompanying relief from neck and shoulder tension and headaches.