HJC i10 Helmet. Features Advanced Polycarbonate Composite Shell Lightweight, superior fit, and comfort using advanced CAD technology Aerodynamic shell shape reduces turbulence Impact-absorbing, multi-density EPS liner ACS Advanced Channeling Ventilation System Full front-to-back airflow flushes heat and humidity up and out Chin bar intake vent provides airflow across the shield interior to help eliminate shield fogging Anti-Fog System Side chin bar venturi exhaust vents for increased heat and humidity dissipation SuperCool® Moisture-Wicking Interior Crown and cheek pads are removable and washable Multi-layer contoured cheek pads improve fit and comfort All CL-17 cheek pads are interchangeable throughout shell sizes Glasses grooves accommodate riders who wear eyeglasses Anti-Fog Lens-Prepared Face Shield and RapidFire™ Shield Replacement System Anti-fog lens-prepared HJ-31 face shield with anti-scratch coating Optically correct, three dimensional face shield offers 95% UV protection RapidFire™ shield replacement system allows for quick, secure, and tool-less shield removal and installation D-Ring Retention System D-Ring with adjustable retention chin strap Bluetooth Ready Bluetooth sold separately Standards: Snell M2020D (3XL DOT Only) Construction: Injection Molded Advanced Polycarbonate Composite Shell Weight: 3.80 lbs / 1725 grams (approx, based on Size Medium Solid Color) Sizing Wrap a tape measure horizontally around your forehead. Select the helmet that is the closest fit to that size. A helmet should fit snug on your head. If it moves while wearing, it is too large. If it is painful to wear, it is too small. Size Chart Size CM: XS 53-54 S 55-56 M 57-58 L 59-60 XL 61-62 2XL 63-64 3XL 65-66
