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The RPHA series denotes the absolute top of the line in the HJC lineup. Constructed of a premium mix of fiberglass composite materials and crafted for state-of-the-art aerodynamics, the RPHA collection has taken HJC into the next level. The RPHA-ST differs from its compatriots in the lineup in that it was specifically designed for the Sport Touring crowd. Specifically, the features and functionality are geared to keep riders comfortable during long hours in the saddle, through various conditions and a variety of circumstances. From the variable venting construction to the internal drop down sun visor, the HJC RPHA ST is a lid for long-rang riders searching for a high-end, highly versatile motorcycle helmet.