Come and see our amazing products.It is made of polycarbonate, and foamed polypropylene is used inside the helmet, which is light and soft.. The size can be adjusted according to different head circumference. The insertion buckle is used to wear and remove the helmet, and the bottom buckle is used for head types of different sizes. Adjust the length of the flat belt to achieve the effect of comfortable wearing and prevent the sliding of the protective support. It is suitable for people who like cycling, roads and highways. Pls confirm further with us if any query about packing info, inventory status and time schedule.