20mm thick tan ground access mats direct factory . industrial Ground nstruction mats 20mm thick for civil [] IN STOCK! - 4x8 Black Mats. Our ground protection mats made from 100% recycled high-density polyethylene (HDPE), can hold up to 100 tons and are tough enough to not break. Mats have cleats and textured tops to aid with helping the vehicles move smoothly on the temporary road. Feature