Using this Bell 4Forty Air MIPS helmet is easy. First, adjust the Float Fit™ system to fit your head comfortably. You can also adjust the 3 - position visor according to your needs. When riding, the built - in Sweat Guide™ will help keep sweat out of your eyes. Make sure to check the Fidlock® magnetic buckle is securely fastened before you start. As for maintenance, use a mild soap and water to clean the helmet. Don't use harsh chemicals as they may damage the shell and padding. Store it in a cool, dry place when not in use. And always check for any signs of damage before each ride. If the helmet has been in a crash, replace it immediately as it may have internal damage that's not visible.