The Krash Helmet's durable shell extends down over the ears for a super-cool throwback BMX and skateboard look. Features: Hard-shell helmet designed for use when riding bikes, scooters, skateboards, or rollerblades Adjustable straps help ensure a proper fit Aerodynamic cooling vents provide optimal airflow Recommended for kids 8-14 years old: Always take a head measurement Fits most youth with heads measuring 54-58cm (21.3-22.8 inches) Complies with the U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older & ASTM 1942