Warp's Plast-O-Mat sheet is the perfect floor runner. It goes down quickly and lays flat, protecting new or freshly cleaned carpets from mud and tracking. Ribs hold dirt until it can be wiped up or carried away. Also handy in campers. As a shelf and drawer liner, Plast-O-Mat is 5 times as thick as normal shelf liner. It won't tear, yet it is easily cut to size with regular scissors. It is almost impervious to spills and wipes clean with a damp cloth. The ribs of Plast-O-Mat allow air to circulate under dishes and glasses. The ribs make the difference.