Ride to school or laps around the neighborhood, the Bell Rally is always up for an adventure. The Bell True Fit system helps ensure a proper fit with just a 1-step adjustment and grows with your child from training wheels to two-wheels. 16 vents keep little heads extra cool and the rear reflectors help ensure an enhanced visibility as your kiddo cruises the neighborhood.• True Fit, 1-step adjustment, fits head size 52-56 cm• PinchGuard ensures pinch-free buckling• 16 vents• Tapeless Technology• CERTIFICATION - COMPLIES WITH THE US CPSC SAFETY STANDARD FOR BICYCLE HELMETS FOR PERSONS AGE 5 AND OLDER•