This cool helmet features: An ABS hard quality plastic outer shell with a lightweight inner shell featuring foam pads Clever magnetic snap-on buckle, pinch-free, with one-handed operation A spin dial in the back to ensure comfort and the perfect fit 11 air vents keep children cool An adjustable chin straps with quick-release buckle Tested and approved for Australian Standards Stylish and comfortable helmet, perfect for kids to scoot, skate and ride safely. Sized to fit a head circumference of 48-53 cms. - Suitable for children up to 5 years old. **Age is only an indication Always take a head measurement. Head sizes and shapes can vary, even within an age range.