The elastic film being in the cavity is directly driven by driving component to make cavity of balancing pump suck or discharge liquid.

This invention concerns an elastic multilayer composite, comprising a breathable non-elastic film layer and an elastic nonwoven layer such as a spunbonded fabric.

By using such elastomeric polymers, the resulting elastic film may also be thermally bonded to the nonwoven web material (s) without the need for oil-resistant adhesives.