4 layer Reinforced Extrusion Laminate.  Consists of two sheets of high strength Polyethylene film laminated together with a third layer of molten polyethylene.  A heavy-duty scrim reinforcement is placed between these plies greatly enhances tear-resistance and increases service life.  Dura-Skrim 2 string-reinforced poly sheeting's heavy duty diamond reinforcement responds to tears immediately by surrounding them and stopping the tear.