STOPP FILT rug underlay with anti-slip has many good qualities. First and foremost, it keeps your rug in place so you don’t slip. It also protects the floor against scratches because the underlay gathers gravel and dirt. Plus, it makes the rug thicker and softer to walk on. Last but not least, the underlay protects the rug from wear. Four smart qualities in one product. Practical, don’t you think?