White is the middle pad of the 5.5in Force set. The picture shows a pair of white pads with a hole through the centre, one of them turned to show its black hook-and-loop back. It follows the orange cutting pad and comes before black finishing.
White is the polishing pad, made of very dense foam. Lake Country lists it for removing light imperfections and for applying a light polish or a cleaner wax, the jobs you would give its standard white polishing pad.
Force pads are Lake Country's dense hybrid foam pads. They are 1.25 inches thick with a tapered edge, and the maker designed them with forced rotation polishers in mind, where it found thicker pads easier to use. The backing is 5 inch, so the pad suits a 5 inch backing plate, and Lake Country says a 4 inch plate works too.
After use, wash the pad with a pad cleaner, lay it flat to dry with the backing facing up, and store it dry in a sealed bag or box.
More in Medium Cut Foam Pads and from Lake Country.