West Biking Bike Helmet MTB Cycling Adult Micro Bicycle Helmet Breathable Racing Helmets polyester * Lightweight : 0.59lb Size:Free Size ( Fit head circumference: 55-60CM) * With the detachable visor, it can protect the eyes from miscellaneous debris, or flip upward to provide better eyesight without losing the protection. * Wind tunnel-aided design with lots of ventilation. * In-Mold polycarbonate shell with EPS liner * Suitable for : Cycling; Climbing; Riding; Touring; Ricing; Skiing