A substrate is provided with a light reflection film in which the heights of a plurality of convex portions or the depths of concave portions formed on a base material are specified to be substantially the same. The use of a polyaldehyde makes it possible to advantageously replace conventional methylene donors while preventing the production of formaldehyde during the vulcanization of the rubber compositions and thus to limit the environmental impact of these compounds. The skin member, the structure member and the cushion body are integrated by a molding. The polymeric microfiltration membrane can be conditioned for the selective separation of phospholipids in the miscella.