Wind-breaking breathable bicycle safety helmet

【Safe and Reliable】: Material: PC shell + high-density EPS buffer layer + non-woven composite sponge lining.DOT safety standard. There are a lot of padding and protective layers inside to provide an excellent protective layer.

【Multiple vent design】: There are multiple vents around the helmet to maximize air circulation, allowing fresh air to continuously enter the helmet, giving you a good riding experience. The optimized vents reduce wind noise and make riding quieter.

【SAFETY FIRST】:The regulator knob taillight， is powered by CR2032 button battery in three bright modes: steady on, fast blinking and slow blinking.The light will keep you seen and safe on the road.

【Size Chart】: Round: The front and back/ear to ear measurements are basically the same. (One size larger is recommended); Round oval: The most common head shape. The front and back measurements are slightly longer than the ear to ear measurements. (Standard size is recommended); Long oval: The head shape is longer from the forehead to the back of the head than the ear to ear measurements. (One size smaller is recommended).