Japanese helmet maker from Saitama that began in 1926 as Hirotake Arai's hat business, shifted to protective headwear for construction crews, and built its first Snell certified helmet in 1963. Still family owned and family run, with executive director Michio "Mitch" Arai and his son Akihito involved. Shells are hand laid and every helmet passes human inspection, not an automated line. Design starts from the R75 rule, an outer curve of at least 75 mm radius meant to help the helmet glance off an obstacle rather than snag on it. The line covers track and street full face models, open face helmets, the XD adventure series, plus car and karting versions.
For riders who put shell integrity and fit above features. Solid colours sit in the higher hundreds, race replicas pass a thousand dollars. Fitment leans round oval, and the tight liner makes intercom installation a chore.
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