Features1Strong in-mold PC shell with shock-absorbing EPS foam provides ultimate conservation. 216 vents keep your kid\u0027s head cool and dry. 3Dtachable inner lining for easy clean. 4Easy-to-use dial system fits different head sizes(19.7\"-22.4\"). 5Adjustable chin strap to assist with a proper fit. 6Rear light for improved visibility and safety at night. 7With a visor to protect your kid\u0027s eyes from sun rays. 8Great gift for your kids, suitable for Cycle,skating,scooter,and other sports.SpecificationThis helmet features strong PC shell with shock-absorbing EPS foam, 16 vents, adjustable dial system, safety light and sun visor to provide your kids maximum experience while Cycle,skating,riding scooter, etc. Features:Strong in-mold PC shell with shock-absorbing EPS foam provides ultimate conservation. 16 vents keep your kid's head cool and dry. Dtachable inner lining for easy clean. Easy-to-use dial system fits different head sizes(19.7"-22.4"). Adjustable chin strap to assist with a proper fit. Rear light for improved visibility and safety at night. With a visor to protect your kid's eyes from sun rays. Great gift for your kids, suitable for Cycle,skating,scooter,and other sports. Specifications:Color: Blue/Black/Red/Pink (optional) Material: PC+EPS Head Circumference: 50-57cm/19.7-22.4in Vents: 16 Battery: 1* CR2032 3.0V 210mAh Weight: Approx. 250g/8.8oz Package List:1* Kid Helmet NOTE:Item color displayed in photos may be showing slightly different on your computer monitor since monitors. Thank for your understanding.Package List1* Kid Helmet NOTE:Item color displayed in photos may be showing slightly different on your computer monitor since monitors. Thank for your understanding.