Mountain Bike Helmet,Adult Cycling Helmet With Camera Mount And, 61 Cm Integrated in-mold PC shell with EPS Foam extends down the sides and back of the head maximum protection and durability.Only weight 310g ,won't weigh you down while you biking. Complies with U.S. Consumer Product Safety Commission Safety Standard for Bicycle Helmets for Persons Age 5 and Older Features a removable visor which can be detached and reattached in seconds ? ideal for both mountain biking and road biking. Built-in action camera mount,allows you record your entire ride while you focus on the joys of riding. 15 large vents for cool on challenging and prolonged rides, along with a comfortable chin pad to prevent chafing Adjustable in sizes from 55-61 cm (21.6-24 inch) and suitable for most of youths and adults , with quick and easy adjustments