If you sleep on your back, choose this medium firmness pillow so that your head is supported but you have only a very gentle curve through to your back. The back sleeper pillow is filled right to the edges to provide medium support and deeper sides provide optimal fullness. Great if you prefer a fuller pillow and it fits a standard pillowcase. It is 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.