Integrated in-mold PC shell with multi-dimensional cone-shape EPS impact foam. Ventilated channel system with14 vents provide cooling airflow when you're riding hard. One-hand Fit adjustment back wheel for comfort wearing, suitable for head circumference 56-62cm. Removable inner quality padding to absorb shocks upon impact and extra sweat. Breathable, removable and soft chin guard and Y-S 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.