The two most important qualities for restful sleep are COMFORT and CORRECT SPINAL ALIGNMENT. Therapeutica? Sleeping Pillows are the only pillows that allow you to sleep on your back and/or side in the correct spinal alignment comfortably.Changing your sleeping position requires different support. That?s why the Therapeutica Sleeping Pillow gives you distinctly different support for back and side sleeping. It provides back and neck therapy while you sleep, relieving stress and relaxing muscles. Therapy for SNORING- The design of the Therapeutica Sleeping Pillow prevents your head from being pushed forward while sleeping on your back and this helps reduce snoring by keeping critical air passages open thus increasing air-flow while you sleep. Back Sleeping Therapy. Unique "Wedge Extension" supports your upper back. "Cervical Contour" maintains the natural curve of your neck. "Center Cavity" cradles head for optimal support and comfort.Side Sleeping Therapy "Raised Side Sections" accommodate shoulder height. "Contoured Head Rests" keep your head and neck level. "Side Cavities" provide flexible cushioning, ensuring jaw comfort, essential for TMJ sufferers.Therapeutica Pillows are the only pillows that allow you to sleep on your back and/or side in the correct sinal alignment comfortably Sizing Instructions; Have someone to assist you measure from your neck to your shoulder bone. Have them measure your LEFT shoulder Stand FACING the person who is measuring you Arms down to your sides Measure from the BASE OF YOUR NECK to EDGE OF YOUR SHOULDER. KEEP THE RULER LEVEL so the end is raised off shoulder. While holding the ruler in place with their left hand they need to measure to the bone on the shoulder (ignore muscle mass) use measurement to choose your size below: - Large 6 ? to 7 ? inches - Medium 5 ? to 6 ? inches - Petite 4 ? to 5 ? inches . All sales of these pillows are final. Not refundable, Not returnable.