?HEAD SAFETY PROTECTION? :Impact resistant PC is not easy to crack and high density EPS foam inside helmet absorb impact energy effectively.CPSC safety certification standard cycling helmets with durable hard shell,soft pad helps absorb impact and protect the head during a collision. adult wear bike helmet will feel safer and more comfortable. ?REMOVABLE SUN VISOR ?.The bicycle helmet with removable sun visor can completely block rain and sunlight. can fit for mountain bike and road bike cycling. ?ADJUSTABLE SIZE?: The bike helmet allows for up and down adjustments as well as tension around the head via the dial in the back,Plus the adjustable straps, adjustable 55-63CM, they enable you to wear the cycle helmet in the correct position,bringing you a more convenient riding experience. ?COMFORTABLE & LIGHT WEIGHT?:The bike helmet made of lightweight material, the inner pad used breathable material which is very comfortable. and 18 vents reduce air resistance and enhance the air flow inside the helmet and move airflow over your head to stay cool, greatly enhances comfort ?COLLOCATION?: The bicycle helmets can be used as Gifts etc, suitable for riding, running, skiing and other outdoor activities.