Track belts are 30 in wide sections of material that lie inside the containment berm and act as a "Buffer" between a vehicle's tires and the berm. Track belts come in pairs and will typically run the length of the berm's usable space. Some customers prefer to get a few extra feet on each end so they can also cover the end walls. The heavy-duty pvc compound offers excellent oil/hydrocarbon resistance as well as good wear characteristics.