4 Modes LED Helmet Lightbike helmet with integrated LED white front light and 10 red leds back light, bright but not dazzling. 4 modes alert lights can well insure your safe when you are riding at night. Fully charging by USB in 2 hours. Adjustable & ComfortableThis cycle helmet allows adjust the head via the buckle and adjustable straps, they enable you to wear the helmet in the correct position for a feeling of reassuring comfort. Head Size: L: 22.83-24in(58-61cm). Integral Helmet ProtectionThe exterior shell ofthe helmetemploys PC material while the interior uses imported high density EPS. With an integral molding of external and internal layers, it dramatically strengthens the helmet impact resistance for safer daily joumeys on the road. Ventilation & BreathableWe introduced the aerodynamics design concept and verified that 14 vents can effectively reduce wind resistance and remove muggy. Widely ApplicanceOur scooter helmets for men and women is suitable for scooter, skateboard, bicycle, roller, motorcycle, skate blading, snowboarding and other outdoor sports at night.