Originally Posted by Karnak

They're called "pre-filter" or "hydro shields" etc. and most companies make them and call it their own personal names. Injen has some, K&N, AEM etc. Its meant to prevent large amount of humidity to reach your filter and "water clog" it to the point your engine would be starving for air, thus, preventing "water bogging" your engine. its not perfect and not meant to be an underwater snorkel like some people found out, but it enables you to drive normally without having issues in storms or winter etc.

K&N Performance Air Filter Wraps

https://www.summitracing.com/int/sea...and-prefilters

https://www.amazon.ca/Injen-Technolo.../dp/B001CO2JMA

Injen - : Pre Filters - Performance Air Intake Systems, Exhaust Systems, Turbo Components, and Air Filters for Cars, Trucks, Motorcycles, ATV's, Boats, and more!