Unique, living hinge design allows hands-free drive in/drive out-no need to manually raise or lower the endwalls. The Ultra-Containment Berm, Ultimate Model is the perfect combination of convenience and economy when it comes to capturing leaks and spills that often occur during equipment maintenance or the transportation of containment drums. This spill containment berm features 12" walls that are supported with a unique "living hinge" that gives them the ability to bend under equipment and snap back into place.