For that added protection during those unsure moments, Injen Technology’s Hydro-Shield Pre-filter are race proven material manufactured from high quality polyester. Uniform micron opening allow the filter of debris .005 or larger. The Hydro-shield pre-filters are factory treated using an embedded hydrophobic process, which allows continuous airflow, water repellency, and maintains HP gains. Note-this products is water repelent not water proof. Comes in Red, Blue and Black.