This is complimented by two NACA (National Advisory Committee for Aeronautics) vents across the top, which are lower drag air inlets with an aim to reduce turbulence at the rear of the helmet.

But the chin vent uses an internal slider that’s near impossible to access when wearing the helmet.” “Neither have very big apertures (don’t be fooled by how big the vent grilles look), so ...

The Shark Spartan RS was one of the first motorcycle helmets from the French safety ... Features include a chin curtain, sun visor, and multiple vents. It’s genuinely a hard product to fault ...