Made from needle punched 100% polypropylene in a rib pattern permanently bonded to a PVC backing. Low non-trip edges keep your mat safe and hazard free. Needle Rib polypropylene pile is tough, non-rotting, non-fading and does not fray. The backing is specially formulated anti-stain PVC. Needle Rib can be shaken or vacuumed. You can also wash Needle Rib with soapy water, thoroughly hosing out to remove all residues. Never machine wash.  Made from needle punched 100% polypropylene in a rib pattern permanently bonded to a PVC backing. Low non-trip edges keep your mat safe and hazard free. Needle Rib polypropylene pile is tough, non-rotting, non-fading and does not fray. The backing is specially formulated anti-stain PVC. Needle Rib can be shaken or vacuumed. You can also wash Needle Rib with soapy water, thoroughly hosing out to remove all residues. Never machine wash.