Make-A-Berm straight sections allows for spill containment to be installed around difficult to move equipment, spill-prone areas, or areas where a standard-shaped berm wont work. Connecting the straight pieces to each other and corner pieces gives you the ability to design the containment needed. 4″ and 6″ berm sections allow for a higher capacity containment. The yellow PVC coated fabric gives good visibility in traffic areas and provides a highly resistant barrier to contain oils, gasoline, acids and other liquids.. Flexible foam inserts are crush resistant and return to their original shape with no memory loss after foot and hand truck equipment traffic.