AquaShield Ship's Anchor Mat, 2 by 3-Feet, Bluestone Unique ridged construction effectively removes and traps dirt and moisture Molded design will not crush or breakdown over time or use Anti-Static, 100-percent premium polypropylene fiber face will not mildew, mold or rot Made with commercial grade SBR rubber backing Waterguard mats are certified slip resistant by the national floor safety institute