By using Donaldson's® advanced Ultra-Web® NanoFiberSM technology, submicron contaminants load on the surface rather than collecting in the depth of the filter. This boosts efficiency and increases performance over convention for your aftermarket intake system. Ultra-Web® NanoFibers™ won't deteriorate as easily as traditional filters. Plus, it's water resistant, so getting wet won't ruin your flow or ever cramp your style. This is why Volant warranties replacement PowerCore™ air-filters for 4 years or 100,000 miles in urban conditions, whichever comes first. This could be the last air filter you ever need to buy!