Constant Pressure Hi-Gloss Foam Pads have a layer of engineered, instant rebound foam between the pad and the backing plate. This layer acts as a cushion or shock absorber between the machine, the operator and the surface being worked on. It absorbs off-axis motion while maintaining a constant and uniform pressure on the surface. (We call this "Constant Pressure™" technology.) This allows even the beginner to achieve professional-like results.