As a helmet that protects children's safety, the most important thing is the protection performance. This ROCKBROS kids bike helmet uses a one-piece PC impact-resistant shell, as well as high-density EPS shock-absorbing cushioning, to maximize your child's safety. At the same time, the comfort of the helmet is also crucial for children, who do not like to be restrained. This toddler bike helmet can switch between full-face helmet and half-helmet mode very freely. The full-face helmet mode can provide more comprehensive sports protection, and the half-helmet mode is more light and breathable.Multiple vents keep your child cool while wearing this children bicycle helmet without feeling stuffy or trapping sweat on your child's head, doubling your child's comfort. At the same time, the soft removable inner lining can perfectly fit the contour of the child's head, giving the child the most comfortable touch. HIGH-VALUE APPEARENCE Three different color combinations, and a cool shape structure, your child will love the look of this helmet, and it is a great gift for children. HEAD CIRCUMFERENCE ADJUSTER The kids bike helmet of this helmet can be easily adjusted by the head circumference adjuster, it fits perfectly with the child's head, making it more secure and comfortable. Removable one-piece lining Soft and comfortable material Heat dissipation and ventilation mesh