The size and shape of the head can vary, even within the age group. AIR FLOW - 16 vents for channeled air flow to keep you cool while you ride. SIZE - Recommended for ages 14 , but will fit most heads measuring 54-58 cm FIT SYSTEM - True Fit system for easy one-step adjustment every time you ride, it's that simple. Importance of Wearing and Replacing Helmets in Cycling Accidents Bell Thalia Women's Cycling Helmet Reviews Bell Women's Poplar Adult Ages 14 And Up Thalia Bicycle Helmet (1 Each Bell Thalia Women's Bike Helmet Important: Always take a head measurement. BELL Adult Thalia Bike Helmet | Home Hardware Size: Recommended for 14+ years old but fits most head sizes 54-58cm. Airflow: 16 vents for a channelled airflow to keep you cool while you ride.
