DuraHold Plus is Made in the USA of synthetic felt and 100% natural rubber. Thermal-set ridges on the upper surface, in an exclusive pattern of chevrons, running in multiple directions, enables the pad to grip the rug more effectively and prevents lateral motion in any direction. DuraHold's backing is made of a superior natural latex rubber formulation in a new, exclusive hexagonal "tire tread" pattern, puts more real rubber in actual contact with any bare floor, no matter how slippery, and provides the highest degree of non-slip traction. 100% synthetic, chemically inert padding contains no plant or animal fibers to decompose, outgas, or aggravate allergies.