With excellent design, exquisite workmanship, integrally molded lightweight high-efficient brim with self! 21 hole air flow guide, to help heat ventilation, to enhance the air flow to reduce air resistance, so that riding become more relaxed. High strength PC shell, but there is light and comfortable, long wear and no pressure, safety and comfort, for the head to bring a new experience of light riding. Integrated, free head regulator, let your unrestrained, adjustable buckle, arbitrary. High density seismic EPS foam, comfortable nylon rope, full range of protection.