PREMIUM PROTECTION: This kid's bike helmet is built-in solid PC shell with impact resistant EPS foam core, which ensure the comprehensive protection of children's head and reduce the risk of being injured when he/she is outdoor skating, cycling, biking. AWESOME VENTILATION: Designing with 6 Air Vents to keep air circulation, which is more comfortable and breathable. This kids helmets help reduce sweating and keep your kid's head cool and dry during intense body movement. COOL COMFORTABLE: The removable inner padding is detachable for easy cleaning. Non-slip soft removable chin pad pad keeps a good fit. Removable visor protects your kid's eyes from sun rays. ADJUSTABLE FIT: Quick-Release buckle is very easy for your kid to operate .The helmet turning knob can be adjusted to an appropriate state quickly according to your kid's circumference. SUITABLE FOR AGE: Head circumference 18.9-20.5inch 2-8years old