[▶ Design of Exhaust Fan : Exhaust fans in the each side promote the flow of airblow dry the sweat quickly and prevent lens from forming fogoffer you the clear and broad vision.(2x AA batteries are not included) ▶ One Size Fits Most : stretchy adjustable neoprene headband ensure the mask fits from teenagers to adults. ▶ Material : Made of engineering strong thermoplastic polyurethanes (TPU)is highly sturdy and anti-shockable to cushion the impact of external forces on the cheek and forehead. ▶ Comfortable : The holes in the mouth will allow you to breathe freely and the lens before eyes will allow you to see clearly.Cheek and forehead pad offer a cushion and absorption of energyprotect our cheeks and nose from being hurt. ▶ No AntiGas Function : Just Costume Props. This mask has no anti-toxic energy.If the Mask have any question please freely contact us we will reply within 24 hours and do our best to solve .No question asked! Try this one without hesitation!]