Specification:Shell material: ABS plasticLining material: EPS shock-absorbing material+spongeSuspension system: OPS adjustable suspension systemHanging material: Polyester webbingDried squid: detachable (BJ version not detachable)Material of guide rail: ABS plasticWeight 530gHelmet thickness: 2mmSuitable For Head size:55-60cmHelmet type:FAST Lightweight outdoor helmettFeatures:1.Lightweight: FAST PJ lightweight outdoor helmet, suitable for multiple scenarios.2.Comfort: The FAST helmet features an ergonomic design and comfortable filling system, providing wearers with a comfortable feel throughout the day.3.Durability: The helmet is made of ABS material and can withstand harsh environmental conditions and long-term use.4.Versatility: FAST helmets can be easily integrated with other tactical equipment, including communication systems and night vision equipment.5.Customizable: The modular design of the helmet allows for easy customization using different accessories and accessories, thus adapting to a wide range of operational requirements.