Arai XD4 Hi-Viz Neon Helmet The Arai XD4 Helmet replaces the category leading Arai XD-3 Dual Sport Helmet. Notable improvements for the XD4 are improved ventilation with redesigned face vents and a venturi vent at the brow, adjustable cheek pads, a new visor system for improved visibility and a new locking shield for aerodynamics. New comfort headliner, with micro fitting 5mm peel away temple pads Fully removable/replaceable/washable Interior Comfort head liner, Cheek pads, Chinstrap covers Dry-Cool technology keeps you dry and cool for greater comfort Patent pending, New FCS (Facial Contour Support) cheek pad design, also with a 5mm peel away micro fit feature New shell shape for better aerodynamic stability at higher street speeds New exhaust ports added to the top diffuser vents New chin vent with more intake ports Larger sculpted side cowl vents improve ventilation Snell M2010 approved