A "pillow top" is a type of mattress design that features an additional layer of cushioning sewn onto the top. This layer is typically made from materials like foam or fiberfill, providing extra softness and comfort. Pillow tops are popular for those who prefer a plush sleeping surface, as they can help relieve pressure points and enhance overall sleep quality. These mattresses come in various sizes and firmness levels, catering to different sleep preferences. When shopping for a mattress, it's essential to consider factors like sleep position, body weight, and personal comfort to find the right pillow top for your needs.