The helmet consists of a shell, a buffer, a cushion, a mask, a wearing device (including a belt, a bow, a button and a helmet-capped system, etc.)。 Shell material:AbsEngineering plasticsNote plasticization Mask material:PcNote plasticization, surface hardening。 Masks permeability: visible light perforation85 per cent Designed system: tapeable900nPull。 Ventilation systems: at least two vents。 Helmet logo, hat badge. Colour meets the requirements。 Helmet specifications:LI don't knowMI don't knowSI don't know. (based on actual measurements)