I have this helmet, I believe it is a motorcycle helmet. I've heard that these aren't the best option for downhill longboarding, but full face longboarding helmets are insanely expensive. But wouldn't
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Aero Helmet
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AeroSlicer V3 Helmet
Buy Triple Eight Racer Downhill Longboard Helmet at the longboard shop in The Hague, Netherlands
TSG Pass Pro Full Face Helmet Matte Firwood Brown + Bonus Visor - CalStreets BoarderLabs