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 soft materials like foam or fiberfill, providing extra comfort and support. Pillow tops are popular for their plush feel, making them ideal for those who enjoy a softer sleeping surface. These mattresses are often found in various sizes and styles, catering to different sleep preferences. The added layer can help relieve pressure points, promoting better sleep quality. However, it's essential to consider factors like firmness and durability when choosing a mattress with a pillow top.