Absorbing and distributing weight, the Five Star Common Foundation is an important support system to the mattress, preventing any sagging or unnecessary strain to any area of the mattress. The headboard height or configuration of your specific bed framework/scenario, may require either a low profile (H5") or a standard profile (H9") foundation. When choosing a quality mattress, one should always choose a quality foundation. This Five Star Common Foundation is available in all standard mattress sizes.