Crazy Mars Baseca Elastic Ultralight Stable Road/Mountain Bike Cycling Helmets Mens Womens-Blue+Black Silk-light grade color EPS foam structure,effectively to reduce the shock pressurestreamlined tail design to reduce the wind resistance Tight binding/No gap, Play a better security role of the head With removable, protective pad liner and sweat chin pad, comfortable to wear and easy to wash. The adjustment set can make the helmet be suitable for you,head girth: 52-61cm, head width18cm. The fashion style make you so fancinated, wind tunnel bring cool air in through the front