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Aerodynamic properties are maximized through extensive wind tunnel testing and professional riders' feedback. Dual-Layer Multi-Density EPS liner enhances impact absorption and ventilation. Four shell and five EPS liner sizes present increased fit options that help to comfortably fit most head sizes. Impact absorbing EPS liner throughout the entire chin bar with Cheek Pad Cooling System. Standard Rear Flaps can be replaced with optional, narrower flaps to customize aerodynamics, depending on rider preference and track demands. Removable Lower Air Spoiler can be affixed to the chin bar to improve aerodynamic stabilization. Upper air intake vent is positioned to maximize air volume into the helmet interior. Top outlet vent is separate from the Rear Stabilizer, allowing it to be positioned for optimum flow-through ventilation. Cheek Pad Cooling System features channels cut through the EPS liner and corresponding air holes in the cheek pad foam, cooling and clearing warm, humid air away from the rider's face. DOT approved. Meets the FMVSS 218 Standard.