Using these goggles is easy. Just put them on like you would any regular goggles and adjust the strap for a comfortable fit around your full - face helmet. When it's wet and muddy, you can attach the roll - offs (sold separately) to keep your vision clear while you're riding at full speed. In sunny conditions, the ChromaPop technology will automatically enhance your view. As for maintenance, clean the lenses gently with a soft cloth to avoid scratches. Store the goggles in a protective case when not in use to prevent damage. And remember, the removable microscreen can be taken out and cleaned as needed for better dirt protection.