BMC racing air filter for BMW R 1250 GS / Adventure from 2019 to 2023 and R 1200 GS from 2013 to 2018.

Single-piece filters (with no joints that could break)
Special cotton filter material soaked in low-viscosity oil
High-strength epoxy mesh resistant to fuel vapors and oxidation
Washable and therefore reusable cotton
Optimal airflow ensuring minimal power loss compared with traditional paper filters
The characteristics of a cotton filter can be summarized as permeability, filtration, retention, and reusability.

Permeability: providing minimal obstruction for maximum airflow
Filtration: preventing foreign matter from entering
Retention: trapping solid particles
Reusability: cotton filters can be reused with BMC-specific cleaning products