1.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.2.One-hand Fit adjustment back wheel for comfort wearing, suitable for head circumference 56-62cm.3.Removable inner quality padding to absorb shocks upon impact and extra sweat.4.Breathable, removable and soft chin guard and Y-S fixing strap for comfort fit.5.Visor attached protects your eye from rain, sun, mud, and tree branches.6.Specially designed for mountain biking, scootering, trail cycling, riding.