Motorcycle helmet air vents now come in all shapes and sizes, and the flow of air through a helmet is considered to be an important comfort factor. No standard for vent shapes exists and there doesn't seem to be any particular system that works better than others. The most common air flow methods used are variations on chin bar vents, top vents and exhaust vents in the back of the helmet.
We designed new Helmet Polystyrene Liners with 6-8 holes, directly letting the air flowing down or circulating around your hair and head area.
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