Built-in LED rear light offers 9 lighting modes to support visibility in low-light riding. USB rechargeable design includes a charging cord, so the rear light can be powered up for your next ride. Helmet is made with EPS foam and plastic and weighs 1.2 lb. Adjustable dial fit system and straps help create a secure, comfortable fit. Fits ages 14+ with a head circumference range of 22.8-24 in (58-61 cm). Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older.