Applicable People: For men and Women Suitable for Head Circumference: 52-62cm (20.4-24.4") Product Components: A main Fast helmets, one set of accesorry, one set of G4 System, one set of facial system Product Material: The main material is ABS plastic (Acry-lonitrile Butadiene Styrene plastic); the material of facial system is low-carbon steel; the material of lens is PC material. Packing List: 1 x Bare Fast Helmet 1 x G4 System 1 x Facial System 1 set of buffering pad (5 pieces) The Helmet is an all-round helmet design with protection mask, Goggles & G4 system, used in active service and airsoft games. The Helmet provides users protection during indoor/MOUT/CQB environments in addition to guarding against BB hits at medium to extreme close range The helmet is also designed to support mounted accessories with G4 system,the rail system has been fixed with helmet body.Most users commonly mount POV Cameras, lights/illuminators, battery box, IFF Markers (identification friend or foe). Compatibility with most aftermarket accessories