Bell Octane Helmet - Youth Bell's Cam-lock strap levers make it easy to adjust the straps around your ears. Simply open the cam...position comfortably and close the lever. Done The ErgoDial Fit System brings one-handed adjustments to our Universal Fit helmets. A simple press of the button and slide of the dial brings firm, snug and comfy stability. Bell's removable Snap-In visor is a simple yet effective solution to harsh light situations.