ITEM TITLE : SA-1 Aerodynamics Mat BlackRed With Anti-Fog Shield Clear Visor 600mm , SUITABLE FOR : 1. The helmet with NACA Duct air flow technology, this air flow system is also used in aircraft's and super cars. 2.The double NACA inlets above the shield allow the entry of the large volume of air inside the helmet to refresh and dehumidify the interior. 3. The NACA inlets on the back of the helmet allow quick extraction of the stale air. MATERIAL : NA , PART NUMBER : NA , Size L