Thick, flat foam sealing ring ensures maximum contact with the airbox, while acting as a breathable gasket for increased air passage, Exclusively formulated adhesive withstands repeated cleanings, even with harsh solvents and biodegradable oils/cleaners, Fine open-pore inner foam acts as a second filter to trap the smallest particles while ensuring maximum air passage, Fused outer and inner elements prevent dirt and grime from being lodged between layers