Applicable for child with age between 4 to 12 years old
1) Use the three-point type fastness technic
2) The material was treated with manifold technics, which made it dustproof and feels comfortable and  tenderness also with good air bells permeability
3) Can efficiently break down the crash pressure with new material and new technics especially with the hollow structure design.
4) It can increase your safety factor by 80% at least.