Description: 【Quality material】: This kids bike helmet is made of quality PC and foam materials, with a comfortable inner lining for long term use 【Comfortable wear】: The full face helmet features a removable inner lining and chin shell, bright colors, flexible use, and comfortable wear 【Tail light included】: This cycling helmet comes with a tail light at the back, making it easy to use even when cycling at night 【Appropriate size】: The size of this bicycle helmet is 27 cmx21 cmx20 cm/10.63 inchx8.27 inchx7.87 inch with an adjustable head circumference suitable for 48 cm to 54 cm. It also features ventilation holes for convenience 【Wide application】: This adjustable bike helmet is nice for outdoor cycling; roller skating; inline skating; skateboarding activities etc Specification: Material: PC and Foam Size Chart: 27cmx21cmx20cm/10.63inchx8.27inchx7.87inch Head Circumference: 48cm/18.90inch to 54cm/21.26inch Package Includes: 1 Bike Helmet Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.