Airaid prefilters are designed to provide extreme protection through maximum filtration. They are manufactured from durable polyester material, which contains uniform micron openings that will filter out debris 0.005 in. and larger. Airaid prefilters are also designed to be water-resistant for added protection. Dyno and flow-bench testing have shown that there is no significant loss in horsepower or airflow caused by the use of these products. To clean, simply wash them with soap and water and then let them air dry.