4 x 8 Temporary Plastic Swamp Ground Protection Mats–HDPE 4× 4 x 8 Temporary Plastic Swamp Ground Protection Mats. Benefits of 4 x 8 ground protection mats: 1. Creates an instant road over basically any type of kind of terrain (mud, sand, marshy, unequal or soft terrain). 2. Safeguards useful turf during landscape design tasks.