We are focus on improving the customer shopping experience, if there is any problem or any issues just try to send us a e-mail we will feedback within 24 hours and try our best to help. Key Features: -Environmental friendly material which is harmless to health, completely safe for use by anyone. – Made from: PC Injection Moulded shell +EPS Polystyrene /Foam. -Nylon adjustable chin strap is comfortable and insures a secure fit , 6 top and side vents provide a comfortable and safe sports experience, good heat dissipation. -Weight:0.41Lb, light, durable and ventilated -Cute bright colors and awesome design, can let your child full of courage and energe, develop love for nature, passion. 19.6~22.5 Inch adjustable diameter size, suitable for children from 2-10 years old. -Package include 1 piece helmet.