The MARK III Booms are our largest, most powerful boom system for heavier seas and harbors where the weather is very uncertain. It has a higher freeboard and deeper draft to contain the spill in very rough seas. Three (3) standard sizes are available or we will custom make a boom to your specifications. SPECIAL NOTE: We have designed a special “tide riser system” that connects to this system and allows the boom to rise and fall with the tide.