Revo Pro-Panel Filters use multi-layered foam technology to trap dust and dirt while maintaining flow efficiency over time. Using foam increases the filter’s surface area and is washable, compared to standard paper and cotton filters which trap dust on the surface and become less efficient the more they are used. The Revo ProPanel is a high-grade direct replacement filter for your vehicle. Designed as direct replacement filters to fit inside your factory airbox and are suitable for road or competition use.