Recommended for kids 5-8 years old: Always take a head measurement Fits most kids with heads measuring 50-54cm (19.7-21.3 inches) Lightweight helmet for use when riding bikes, scooters, skateboards, or rollerblades Complies with the U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older Adjustable straps help ensure a proper fit, and aerodynamic cooling vents for great airflow Krash Signature Series multisport child helmet is the perfect lightweight helmet for use when riding a bicycle, skateboard, or scooter, or roller-skating. This clean, traditional style bike & skate helmet is built to fit low on the rider's head and have a sleek profile. Air vents are positioned throughout the helmet for maximum airflow. Soft inner padding and comfortable adjustable nylon straps help ensure a proper fit