An underlay linen, also known as a table underlay or base cloth, is a foundational piece used in event planning and design, particularly for table settings. This linen is typically placed directly on the table before any other tablecloths or overlays are added. The purpose of the underlay linen is to protect the table from spills or scratches, add extra padding for dishes and utensils, and contribute to the overall aesthetic of the table setting. It often complements the color scheme or theme of the event. The underlay linen can be of the same size as the table or it can hang longer, depending on the desired look. It's a crucial component in creating a layered, polished, and professional look for any event.