Features:HIGH QUALITY MATERIALS: This bike helmets is made of high quality materials that are resistant to drops, unbreakable and sturdy.Breathable: multiple ventilation holes designed to maintain breathability during long rides.Safe and reliable: high quality LED lights with bright and long lasting flash patterns for increased visibility and safety .Four light modes: multiple light settings for different visibility in different environments.GREAT GIFT: This bike helmets is a great gift for cyclists on Christmas/Halloween/Thanksgiving/Birthday light holidays.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurementDescription:Material: PlasticS (48-53cm head circumference)M (54-57cm head circumference)L (58-61cm head circumference)XL (61-64cm head circumference)