This allows the integrity of the helmet's inner EPS liner to remain intact Ventilation System: SHOEI's wind tunnels helped to reveal the optimal balance between airflow and silence Large lower vent shutter for ease of use with riding gloves optimizes air flow while in the riding position All-new exhaust outlets flank adjustable upper air intake for improved hot-air expulsion Micro Ratchet Chin Strap: Patent-pending 100% stainless steel interlocking mechanism Quick and smooth closure and release Comfortable and easily adjustable Noise Reduction: All-new "Noise Isolator" cheek pads deflect wind and reduce unwanted noise New airtight window bead and the face cover's "Vortex Generator" lip reduce noise and manage airflow around the helmet Enhanced shell shape improves noise control and aerodynamics 3D Interior Liner System: The entire interior liner (cheek pads, center pads, and chin strap covers) is easily removed for cleaning or replacement Each component of the inner liner is ergonomically designed to offer the ultimate in safety, fit, and comfort Comfortable, 3D helmet liner material quickly dissipates moisture Eyeglass compatible interior is optimized for many different sizes of eyeglasses, while still minimizing gaps that can cause excess interior noise CNS-3 Shield and Base Plate System: All-new design provides approved air/water sealing and noise reduction Protects from 99% of the sun's damaging UV rays 3D injection-molding ensures distortion-free view throughout the entire field of vision CNS-3 base plate system facilitates smooth and easy shield changes and a wind and waterproof seal New airtight window beading drains and prevents water from entering the helmet Comes equipped with a Pinlock® EVO fog-resistant system New shell design improves noise control and aerodynamics Medium helmet weighs 4 lbs 1 oz DOT-218 Approved.