Disney Pixar Cars Unisex Child Hardshell Red Lightning Mcqueen Bike Bicycle Skateboard Helmet Red Ages 5+ by Bell Cars Child MS Hardshell protection for trails or skate park. Top and rear vents to cool your head. Side-squeeze buckle for easy adjustment .CPSC bike and ASTM-1492 skate compliant. Fits head sizes 20.1 to 21.3 inches.