Using your ModCycles MMG open - face helmet is easy. First, make sure you adjust the straps so the helmet fits snugly on your head. When you're riding, always keep the helmet on to protect yourself. As for maintenance, use a soft cloth and mild soap to clean the exterior of the helmet. Don't use harsh chemicals as they can damage the carbon fiber. Store the helmet in a cool, dry place. Also, check the helmet regularly for any signs of damage, like cracks or loose parts. If you notice any issues, stop using the helmet and get it replaced.