Your floor will be happy because the underlay gathers the dirt and protects it from scratching. It keeps your rug from sliding around and makes it even softer to walk on. Keeps the rug in place, which reduces the risk of slipping and makes it easier to vacuum. It is easy to cut or fold the underlay, or combine several together, to fit under rugs of all sizes and shapes. The thick felt makes the rug softer and warmer to walk on. Protects the floor because it collects dirt and gravel.