Article description\n\nFoam filter TwinAir\n\nOver 40 years ago, the sandy, gravelly soils of the Netherlands - and the resulting engine failures - proved that foam and paper filters gave riders airflow but failed to protect them.\n\nTwin Air's breakthrough, combined dual-layer design combines performance and protection.\n\nThe fused layers of open-cell foam and fine inner foam trap even the smallest particles.\n\nThe new, rounder design increases airflow. This also applies to the minimized seams, made possible by a revolutionary micro-bonding process: shorter seams = more foam = more flow.\n\n- with flowable, recoil-resistant foam laminated to the inside of the filter\n- washable and reusable (40 to 50 times is common)\n- two-layer foam (made to specification with cells of equal size and distribution)\n- high quality (assembled by hand and checked for perfect fit)\nFoam filter TwinAir\nOver 40 years ago, the sandy, gravelly soils of the Netherlands - and the resulting engine failure.