Giro Flume Youth Bike Helmet Treat kids to the cool, sleek design of the Giro  Bike Flume Helmet while you enjoy the peace of mind that comes with quality Giro  products. The Flume features a microshell in-mold construction, making the helmet extremely sturdy, able to withstand the even roughest falls. Giros  AcuDial  fit system, along with twenty air vents, will keep kids cool and comfortable for hours of riding. Microshell in-mold construction AcuDial  fit system 20 air vents Detachable snap-fit visor