If you sleep on your back, choose a medium firmness pillow so that your head is supported but you have only a very gentle curve through to your back. Our back sleeper pillow is filled to provide medium support and deeper sides providing optimal fullness. Great if you prefer a fuller pillow; and it fits a standard pillowcase. All our synthetic pillows are non allergenic, which means there\'s nothing in them that could cause allergic reactions; which is great for peace of mind and essential of allergy sufferers.