Over 50 years ago, the sandy, gritty soil of The Netherlands and the resulting engine failures proved that single-foam and paper filters gave riders air flow, but failed at protection. Twin Airs breakthrough, fused-dual-layer design (now widely copied) combined performance and protection. The fused layers of open-pore foam and fine inner foam trap even the smallest particles. The new, rounder design boosts airflow. So do the minimized seams made possible by a revolutionary micro-gluing process: shorter seams = more foam = more flow.

Features:
* washable and reusable – reusing a Twin Air filter 30 times is common
* dual-layer foam made to Twin Air specifications, with cells that are evenly sized and distributed
* minimized seams made possible by a revolutionary micro-gluing process
* greaseless sealing ring
* assembled by hand and inspected for a perfect fit
* packaged in a resealable and reusable bag