Features1With strength and toughness at the same time, combined with EPS cushioning foam, which is light and highquality, it provides allround protection for yourself, which can safely and effectively reduce the impact of collisions and protect your head. 2The helmet is ventilated to provide cooling airflow, suitable for riders of all ages. The special aerodynamic design allows air to circulate and keeps cool while riding a bicycle. 3The double buckle provides good support, and the highdensity nylon braid has a strong pulling force. It adopts geartype adjustment, and adjusts the size by rotating left and right, which is simple and fast. 4The reference head circumference is between 58cm-63cm, and the head width is about 17.5cm. There is an adjuster knob to adjust the size of the head circumference. 5The adjuster clip and buckle are positioned away from the rider's face to provide comfort and satisfy most cyclists' satisfaction.SpecificationItem Type: Bicycle HelmetMaterial: PC helmet + EPS foam + Nylon webbing + PP adjusterReference Head Circumference: Approx. 58-63cm/22.8-24.8inHead Width: Approx. 17.5cm/6.9inThere is an adjuster knob to adjust the size of the head circumference.Applicable People: Both men and women are suitableFeatures: Comfortable and breathable, multi-layer protection, convenient installation, light weight and high quality, air circulation, firm base.Package List1 x Helmet