Arai did the only thing possible to this groundbreaking, critically acclaimed street and dirt crossover helmet. The new XD4 has Arai's intermediate oval interior shape, along with new top-diffuser-vent ports which nearly double the XD4's airflow, while its new shell shape provides better aerodynamic stability at higher street speeds in concert with its high-flow peak and new side cowl vents. These larger, sculpted vents improve ventilation efficiency as well as helmet stability on your head at speed. Also featuring a new chin vent which has more intake ports for improved airflow. And like its predecessor, the vent's chin bar is rounded with less protrusion making it less likely to catch and dig in during a spill, than most other designs. Its oval form is actually based on the egg's, long known for its extremely strong and efficient shape. Arai's amazing new patent-pending FCS (Facial Contour Support) cheek pad design delivers comfort, support and fit like nothing you've ever felt, and it features our exclusive 5 mm peel-away custom fit layer. Arai has also added our trademark brow vents to the new XD4 face shield, providing airflow to the temple area of the head. The XD-4 also includes Arai's patented Dry-Cool technology to keep you drier and cooler (hence the name) for greater long-haul comfort. The XD-4 debuts the Emergency Release Cheek Pad Release System. From Arai's decades long commitment to building helmets that do more for riders comes this major innovation, the very first emergency release cheek pad design created specifically for motorcycle helmets. Developed to allow easier access to an injured rider, the XD4's cheek pads slide out easily via the integrated pull-tabs built into the underside of the cheek pad, making helmet removal much easier for trained medical personnel. FEATURES New exhaust ports added to the top diffuser vents nearly double the airflow while using the same (4) 10mm vent holes in the helmet shell. The ability to increase performance from existing designs is typical of Arais evolutionary thinking. New shell shape for better aerodynamic stability at higher street speeds, works in concert with the high-flow peak and new side cowl vents. New exhaust ports added to the top diffuser vents nearly double the airflow while using the same (4) 10mm vent holes in the helmet shell. The ability to increase performance from existing designs is typical of Araisevolutionary thinking. New shell shape for better aerodynamic stability at higher street speeds, works in concert with the high-flow peak and new side cowl vents. New chin vent with more intake ports. Larger sculpted side cowl vents improve ventilation efficiency as well as helmet stability at higher speeds. The 5mm peel-away temple pads add another level of customization, providing a little extra width when needed. Fully removable/replaceable/washable Interior: Comfort head liner, Cheek pads, Chinstrap covers. Dry-Cool technology keeps you dry & cool for greater comfort. New FCS (Facial Contour Support) cheek pad design. Patent pending design adds just the right amount of pressure when needed while being worn, but seamlessly get out of the way when putting on and taking off the XD4. Another example of Arais attention to all aspects of fit. The all new XD-4 now comes standard with the Visor fitted with Pinlock Posts Arai has added our trademark Brow Vents to the new XD4 faceshield, providing airflow to the temple area of the head.