Aerodynamic properties are maximized through extensive wind tunnel testing and professional riders's feedback. The Aero Edge Spoiler dramatically reduces drag and lift coefficients, thus diminishing rider fatigue and increasing performance. Offers unmatched ventilation with internal channels and exhaust ports throughout the helmet. The Dual Air Charge system: A forehead lower intake and a forehead upper "Air Scoop II", combine to maximize flow through ventilation. Outlet holes in the Aero Edge Spoiler allow warm air to be exhuasted. The lower air intake provides an additional sources of air flow. The neck outlet vent allows for effective air exhaust. High performance fiber materials are combined with extremely elastic organic fibers to create a shell structure that is ultra lightweight, rigid and resilient. Exhaled air is absorbed into the "Breath Chamber II" and exhuasted by nagative air pressure, thus eliminating shield fogging. The lower air intake provides air flow that helps to diminish shield fogging. The entire interior lining (cheek pads, upper liner and chin strap covers) is easily removed to allow for cleaning. Each component of the inner liner is ergonomically designed to offer safety, fit and comfort. Standard Chin-Strap Clip neatly secures chin strap.DOT AND SNELL M-2000.