This is where it all began. Over 40 years ago, the sandy, gritty soil of The Netherlands and the resulting engine failures proved that singlefoam and paper filters gave riders air flow, but failed at protection. Twin Airs breakthrough, fused-dual-layer des
This is where it all began. Over 40 years ago, the sandy, gritty soil of The Netherlands and the resulting engine failures proved that singlefoam 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.
$25
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