Foam density: 25KG/m³ sponge hybrid fibre foam. Bamboo pillow: Get a bamboo 'bed wedge' pillow with removable cover. Covers: Choice of waterproof or bamboo cover. Machine washable: Cover with zip which makes it removable and machine washable. Firmness: In a medium-firm firmness at a 35-40 degree angle. Recline wedge pillow multipurpose: Can help with acid reflux, heartburn, as a support through pregnancy and sports injuries. Bamboo Bed Wedge Pillow | Living Social