MR.Jiang Bike Bicycle Cycling Helmet with Visor Adjustable 25 holes design makes it not only unique, beautiful design and fashionable pattern, comfortable and breathable easy to wear. Wind tunnel design, effectively reduce wind resistance. Size:about 32 x 22 x ??11.5cm Head circumference:about 58-63cm adjustable. Streamlined design, anti-windage, lightweight, strong. With visor, comfortable lining, with regulator.