... helmet is consist of shell, cushion breaker, crown, helmet lock adjust system; adorn device, mask, steady rest and camail etc. ... lWeight:≤1.5kglCamail width:120mm±10lConnective belt width:20mm±2lHelmet lock adjusts method: by Velcro can be adjusted.lCrown adjustment ... to wear gas masks and other installation of communication system.lQuality meets 'GA294-2001 Police Anti riot helmet ' ...