Weather Guard Shelf Mat 13.5" Model 8841Weather Guard Shelf Mat 13. 5" Model 8841 Resilient foam shelf liners help keep van shelving systems quiet during bumpy rides. The Model 8841 Shelf Mat is a 150in long roll and can be used to line 13. 5in deep cargo van shelving and van storage drawers. Easy to cut to size, the mat is made from durable, chemical resistant, closed cell foam and offers low water absorption, reduced vapor transmission, excellent chemical resistance, and superior noise