Pillow inserts are the soft, inner components of decorative or functional pillows. They provide shape and support, making pillows comfortable for resting or enhancing the aesthetic of a room. Common materials used for pillow inserts include polyester, down, and memory foam, each offering different levels of firmness and softness. These inserts come in various sizes and shapes, allowing them to fit into different types of pillow covers. When choosing a pillow insert, it's essential to consider the intended use, such as for cushions on a sofa or for sleeping at night, to ensure the right level of comfort and support.