What safety feature should a helmet have for night riding?

For night riding, a helmet should include built-in lights or reflective strips to enhance visibility in low-light conditions. These features are critical because they help ensure that the rider is seen by others, such as motorists or pedestrians, which is vital for safety during nighttime activities. Visibility is significantly reduced at night, and having lights or reflective materials can greatly improve the chances of being noticed, thereby reducing the risk of accidents.

While sun protection through a visor, comfort from extra padding, and ventilation are important aspects of helmet design for daytime riding and general use, they do not address the specific safety concerns that arise when riding at night. The core function of the safety feature in this context is to facilitate visibility, making built-in lights or reflective strips the most appropriate choice for night riding safety.