Recommended for ages 5-8 years old, but will fit most heads measuring 50-54 cm Pinch guard buckle for pinch free buckling under the chin. Adjustable straps for a custom fit, extended rear coverage, and aerodynamic cooling vents provide excellent airflow for a comfortable ride. Complies with the U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older Show off your flair with Barbie and her friends in this kids Barbie bicycle helmet by Bell.