Everything is designed to be just right. Convenient, safe, comfortable folding helmet for children to play freely, more convenient, double-choice more safe pressing button button button unclamping hand, ladder type card clasp, easy installation can be installed taillight, safer riding at night. Humanized head circumference adjustment design, the head circumference mother may use the Knob to carry on the elastic adjustment, also carries on the upper and lower third gear adjustment, can better the forehead conforms to the head shape, the protection is more in place. Ventilation and ventilation, wear not hot, one-piece molding, indestructible. Preferential PC and EPS anti-impact materials, one-piece forming process, can better protect the head. Detachable precipitation, Shock Absorption Sweat, soft, shock absorption sweat, let the child more comfortable. Hardness: Using PC shell, the hardness of PVC shell compared to ordinary shell has a significant increase, the PC shell acid and alkali resistance, high temperature and low temperature can resist external strong impact, not easy to deformation, protection and safety, wear experience: Light Grade EPS Foam, weight only about 200 grams, more care of the child's cervical spine health, PVC shell material, the inner use of EPS damping material, I adhere to the division of safety, environmental protection, health principles, helmet with a regulator, can adjust the size at will, does not affect the line of sight, better fit to the head. Sweat