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Twin air dual stage filters are the choice of top factory teams and riders world wide. Fine open-pore inner foam acts as a second filter to trap the smallest particles while ensuring maximum air passage. Exclusively formulated adhesive ensures glue seams will not break down. Thick, flat foam, greaseless sealing ring ensures maximum contact with the airbox, while acting as a breathable gasket for increased air passage. Fused outer and inner elements prevent dirt and grime from being lodged between layers, unlike Twin Air; this can be a problem with inferior two-piece designs. Trapped particles can restrict airflow. And if dirt works its way into the engine, a pinhead-sized granule will gouge the cylinder, piston and rings like a bullet.