The CRNK Genetic Alpha Black M has built-in lighting, so you can head out on your bike extra safely. The light is on the back and has 3 modes: always on, slow flashing, fast flashing. That way, others can notice you easily when you bike in busy traffic or in the dark. The helmet feels comfortable and the ventilation holes keep your head cool. You can also remove the lining, which allows you to wash it. This keeps the helmet fresh and prevents irritation. You can easily open and close the magnetic buckle with 1 hand. The helmet is suitable for a 52 to 56cm head circumference.