Make-A-Berm Heavy Duty allows for spill containment to be installed around difficult to move equipment, spill-prone areas, or areas where a standard-shaped berm wont work. Heavy Duty vented Corner pieces are key to providing a full spill containment. These allow air to flow thru as forklift traffic and hand truck equipment are being used. Non-absorbent Orange modified PVC coated fabric provides a highly resistant barrier to contain oils, gasoline, acids and other liquids.