Using the Bell 4Forty Air MIPS helmet is easy. First, adjust the Bell Float Fit™ system to get a snug and comfortable fit on your head. You can change the position of the visor according to your needs and light conditions. When you're riding, the helmet will effectively manage sweat and keep you cool with its great ventilation. As for the eyewear ports, you can easily place your glasses there. After each ride, use a mild soap and water to clean the helmet. Don't use harsh chemicals as they may damage the materials. Store it in a cool, dry place, away from direct sunlight. Always check the helmet for any signs of damage before each use, and if you notice any cracks or significant wear, it's time to get a new one.