1、ADJUSTABLE: Turn the knob at the back for proper fit, the suggested head circumference is 22.4-24.4in. 2、BREATHABLE: 22 air vents increase air circulation and reduce sweating to keep your head comfortable during Cycle. 3、PROTECTIVE \u0026 SAFE: Impact resistant PC is not easy to crack and high density EPS foam is buffered, which surely improve safe performance. 4、UV PROTECTIVE: Detachable visor reduce the harm of strong sunlight while protect your face and eyes from wind, sand and dust. 5、SAFETY LIGHT: Built-in a back light with 3 modes for warning and lighting in dark riding. 6、COMFORTABLE: Take down the absorbent lining and soft chin pad for cleaning and a quick release buckle for easy take off. Impact resistant PC with high density EPS foam to protect your head from unexpected injury; detachable visor is UV protective to block out harmful sunlight, and the back light provide safety lighting for night riding. A nice bike helmet for your riding trip! Features: ADJUSTABLE: Turn the knob at the back for proper fit, the suggested head circumference is 22.4-24.4in. BREATHABLE: 22 air vents increase air circulation and reduce sweating to keep your head comfortable during Cycle. PROTECTIVE & SAFE: Impact resistant PC is not easy to crack and high density EPS foam is buffered, which surely improve safe performance. UV PROTECTIVE: Detachable visor reduce the harm of strong sunlight while protect your face and eyes from wind, sand and dust. SAFETY LIGHT: Built-in a back light with 3 modes for warning and lighting in dark riding,includes always on mode,fast flashing mode and slow flashing mode. COMFORTABLE: Take down the absorbent lining and soft chin pad for cleaning and a quick release buckle for easy take off. Specification: Color: Green & black / Yellow & black / Blue & black / Black & white / Red & grey / Red & white / White & grey / Blue & white / Silver & grey / Silver & red  (optional) Material: PC + EPS Air vents: 22 Head circumference: 57-62cm / 22.4-24.4in Battery: 1* 3.0V 120 mAh CR1632 battery Weight: 281g / 9.9oz Package weight: 349g / 13oz Package List: 1* Bike Helmet 1* Detachable Visor NOTE: Item color displayed in photos may be showing slightly different on your computer monitor since monitors. Thank for your understanding. 1* Bike Helmet 1* Detachable Visor NOTE: Item color displayed in photos may be showing slightly different on your computer monitor since monitors. Thank for your understanding.