The X-ELEVEN has been the helmet of choice for professional riders since it?s introduction. Built to race specifications, the X-Eleven was designed and developed in collaboration with professional riders.The world?s most demanding riders demand nothing but the best...the X-ELEVEN only from Shoei. Features and Benefits Quick Release Base Plate System Dual Liner Ventilation System 3D Comfort Liner System Upper Air Intake Lower Air Intake Dual Air Charge System Face Shield Defogging Vent Chin Curtain Rear Air Exhaust Neck Outlet Vent Exhaust Breath Chamber Breath Guard Aero Edge Spoiler With Exhaust Vent Preset Shield Opening Lever With Locking Mechanism CX-1V Shield AIM+Shell Construction