Description: - 【Multiple Materials】: Kids bike helmet, PC shell and aviation grade thickened EPS are self contained and do not need to be spliced. The shell is hard and the liner is thick; full edge design, shock absorption and buffering - 【Breathable】: Skateboard cycling helmet with 11 enlarged ventilation holes, comfortable and breathable, can quickly wick away sweat; it has a sponge lining, which can be removed and washed - 【Adjustable】: Head circumference adjustment knob, rotate left and right; can adjust the head circumference to prevent the helmet from - 【Lightweight Design】: cyling helmet only 170g, reducing the burden on the neck during riding; the buckle is firm and tight, simple and convenient to operate, and quick to wear - 【Wide Application】: Riding helmet is very suitable for roller skating, skateboarding, scooters, and cycling enthusiasts Specification: - Material: PC Shell EPS material - Product Size: Adjustable head circumference 54 cm-58 cm/21.26 inch-22.83 inch Package Includes: 1 Kids Bike Helmet Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.