This mountain bike helmet seeks ultra-lightweight construction, ample ventilation, comfort wearing and streamline shape for reducing resistance all of which make it one-of-a-kind helmet for mountain biking, trail cycling It also features an in-mold PC shell and EPS liner integration for amazing impact protection, with the fit adjustment in wheel to make it feel snug, Y-shape adjustable fixing strap and breathable soft chin guard.   Features: Integrated in-mold PC shell with multi-dimensional cone-shape EPS impact foam.  Ventilated channel system with13 vents provide cooling airflow when you're riding hard.  One-hand Fit adjustment back wheel for comfort wearing, suitable for head circumference 22.0 -24.4 inch.  Removable inner quality padding to absorb shocks upon impact and extra sweat.  Breathable, removable and soft chin guard and YS fixing strap for comfort fit.  Visor attached protects your eye from rain, sun, mud, and tree branches.  Specially designed for mountain biking, scootering, trail cycling, riding.   Note: Please do not apply it on motor vehicles.   Specifications: Color: Matt Black / Blue+Yellow / Yellow + Black + Red / Blue + Red + White / White / Red (Optional);  Material: EPS & PC;  Vents: 13;  Head circumference: 56-62cm / 22.0-24.4 in;  Net weight: Approx. 361g / 12.8oz;  Package size: Approx. 33 * 23 * 20cm / 13.0 * 9.1 * 7.9in;  Package weight: Approx. 369g / 13.0oz;   Package List: 1 * Helmet