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 Coloured to match the Vintage Blue Trybike TB6142. Stylish and comfortable helmet, perfect for kids to scoot, skate and ride safely. Sized to fit a head circumference of Extra Small: 45-51 cms. - Suitable for children from 18 months. **Age is only an indication Always take a head measurement. Head sizes and shapes can vary, even within an age range.