Meet your new favorite helmet. Lennon is vented for breathability, adjustable for the perfect fit, and equipped with a built-in LED light for safety. No matter your skill level or what time you like to ride, Lennon will easily become your go-to biking accessory. Features: Bike helmet designed for everyday bike and skate 15 air vents and a contoured design for optimal airflow Interior padding wicks away sweat ErgoKnob Dial allows for a snug fit Fully formed protective shell EPS foam lining Adjustable, reflective straps 5-LED safety light on the back of the helmet features 3 functions to keep you visible Complies with U.S. CPSC safety standards for bicycle helmets for persons age 5 and older One Size Fits Most: 54-61 cm/21.25-24 in