To extend the life of your rug, it is extremely important to safeguard it by using an underlay. This 12 x 9 Feet rug pad is made from good quality polyester fibers, coated with latex free rubber compound that makes it nonslippery on any smooth surface. The open weave construction keeps it ventilated by offering maximum air circulation. Great for indoors and outdoors, simply shake it to get rid of dirt and debris.