"Using helmet correctly during cycling could reduce the index of harm up to about 85% according to the research. This helmet with EPS polyfoam board construction provide effective buffer action and shock absorption when hit by external force to protect your head. Features: PC shell with high-density EPS polyfoam board inside provide effective buffer action and shock absorption when hit by external force to protect your head. Suitable for 22.4-24.4in head circumference, and adjust the knob behind to fit your head properly. Come with shield goggle which is easy to install with magnet sheet and effectively protect your eyes during cycling. Sweat absorbing lining with fastener tape for comfortable wearing and easy and convenient to take down to clean. Warning light with 3 modes behind the helmet increase visibility and safety in dark. Adjustable head strap with quick release buckle for easy on and off and firm fixation. Specifications: Material: PC & EPS Color: Red /  Blue / White / Black (optional) Head circumference: 57-62cm / 22.4-24.4in Size: 27 * 21 * 19cm / 10.6 * 8.3 * 7.5in Weight: 280g / 9.9oz Package List: 1 * Helmet 1 * Goggle Lens"