The MET Crackerjack is simply the most popular helmet for young riders who deserve the best, not only in safety, but also in great design and style that they will love to see. To enhance the Crackerjack's visibility, MET included an integrated LED taillight, which can be used at night so riders are always safe and visible. One of the greatest features of the MET Crackerjack is its adjustable size. The helmet can be increased in size from 52 to 57cm, ensuring that the helmet will grow with the child.