Light in weight, but heavy duty, the secret is the HDPE (High Density Polyethylene) plastic. HDPE is designed to bend but not break and, depending on the terrain, can withstand up to a 60 ton load. Each of these mats measures 4'x8'x1/2" and weighs just 70 lbs. They are tough, flexible, durable, and affordable. If you will buy more than 6 sheets