With its rounded profile, snap-in visor and casual vibe, the Piston adapts easily to your style of riding. Its high-quality Fusion In-Mold construction ensures Piston's strength and durability. It has 15 extra-large vents for cool comfort, and the ErgoDial fit system - paired with easyto- adjust Cam-Lock levers - gives Piston a precise fit. 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. 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.