Ground Protection Mats System7 Mat 8 ft x 14 ft - 4 ¼ inches thick and made of Polyethylene Plastic. Matrax Heavy Duty Drivable mposite Mats 4x4 Ft Grey - 1 ½ inches thick and made of polyethylene plastic. Mud-Traks Super Ground Protection Mat - Rope Handles 32 in x 8 ft - 10mm thick and made of fiberglass.