Features1A buckle that meets safety standards is used to slip off smoothly and lock firmly. 2The inner lining is detachable, comfortable to wear and the head circumference is adjustable for wider application. 3The rear head protection is upgraded safely, the tail is lengthened and the safety factor of the wrapped head is higher. 4The pneumatic helmet is formed in one piece, and the PC+EPS high-strength shell is not afraid of strong impact. 5Highvalue appearance design, two colors to choose from and durable.SpecificationItem Type: GUB Cycling HelmetMaterial: PC+EPSHead Circumference: M Size: Approx. 54 ~ 58cm / 21.3 ~ 22.8inL Size: Approx. 58 ~ 62cm / 22.8 ~ 24.4inNumber of Holes: 17Size: Approx. 27cm / 10.6in15cm / 5.9in21.5cm / 8.5inPackage List1 x GUB Cycling Helmet1 x User Manual